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Posted to commits@tajo.apache.org by hy...@apache.org on 2014/12/11 15:41:22 UTC
svn commit: r1644656 [15/20] - in /tajo/site/docs/devel: ./ _sources/
_sources/backup_and_restore/ _sources/configuration/ _sources/functions/
_sources/getting_started/ _sources/partitioning/ _sources/sql_language/
_sources/table_management/ _sources/t...
Added: tajo/site/docs/devel/sql_language.html
URL: http://svn.apache.org/viewvc/tajo/site/docs/devel/sql_language.html?rev=1644656&view=auto
==============================================================================
--- tajo/site/docs/devel/sql_language.html (added)
+++ tajo/site/docs/devel/sql_language.html Thu Dec 11 14:41:20 2014
@@ -0,0 +1,247 @@
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+
+<!DOCTYPE html>
+<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
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+ <link rel="next" title="Data Model" href="sql_language/data_model.html"/>
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+<li class="toctree-l2"><a class="reference internal" href="getting_started/downloading_source.html">Dowload and unpack the source code</a></li>
+<li class="toctree-l2"><a class="reference internal" href="getting_started/building.html">Build source code</a></li>
+<li class="toctree-l2"><a class="reference internal" href="getting_started/local_setup.html">Setting up a local Tajo cluster</a></li>
+<li class="toctree-l2"><a class="reference internal" href="getting_started/first_query.html">First query execution</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="configuration.html">Configuration</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="configuration/preliminary.html">Preliminary</a></li>
+<li class="toctree-l2"><a class="reference internal" href="configuration/cluster_setup.html">Cluster Setup</a></li>
+<li class="toctree-l2"><a class="reference internal" href="configuration/tajo_master_configuration.html">Tajo Master Configuration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="configuration/worker_configuration.html">Worker Configuration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="configuration/catalog_configuration.html">Catalog Configuration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="configuration/configuration_defaults.html">Configuration Defaults</a></li>
+<li class="toctree-l2"><a class="reference internal" href="configuration/ha_configuration.html">High Availability for TajoMaster</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="tsql.html">Tajo Shell (TSQL)</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="tsql/meta_command.html">Meta Commands</a></li>
+<li class="toctree-l2"><a class="reference internal" href="tsql/dfs_command.html">Executing HDFS commands</a></li>
+<li class="toctree-l2"><a class="reference internal" href="tsql/variables.html">Session Variables</a></li>
+<li class="toctree-l2"><a class="reference internal" href="tsql/admin_command.html">Administration Commands</a></li>
+<li class="toctree-l2"><a class="reference internal" href="tsql/intro.html">Introducing to TSQL</a></li>
+<li class="toctree-l2"><a class="reference internal" href="tsql/single_command.html">Executing a single command</a></li>
+<li class="toctree-l2"><a class="reference internal" href="tsql/execute_file.html">Executing Queries from Files</a></li>
+<li class="toctree-l2"><a class="reference internal" href="tsql/background_command.html">Executing as background process</a></li>
+</ul>
+</li>
+<li class="toctree-l1 current"><a class="current reference internal" href="">SQL Language</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="sql_language/data_model.html">Data Model</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sql_language/ddl.html">Data Definition Language</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sql_language/insert.html">INSERT (OVERWRITE) INTO</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sql_language/queries.html">Queries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sql_language/sql_expression.html">SQL Expressions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sql_language/predicates.html">Predicates</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="functions.html">Functions</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="functions/math_func_and_operators.html">Math Functions and Operators</a></li>
+<li class="toctree-l2"><a class="reference internal" href="functions/string_func_and_operators.html">String Functions and Operators</a></li>
+<li class="toctree-l2"><a class="reference internal" href="functions/datetime_func_and_operators.html">DateTime Functions and Operators</a></li>
+<li class="toctree-l2"><a class="reference internal" href="functions/network_func_and_operators.html">Network Functions and Operators</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="table_management.html">Table Management</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="table_management/table_overview.html">Overview of Tajo Tables</a></li>
+<li class="toctree-l2"><a class="reference internal" href="table_management/file_formats.html">File Formats</a></li>
+<li class="toctree-l2"><a class="reference internal" href="table_management/compression.html">Compression</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="table_partitioning.html">Table Partitioning</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="partitioning/intro_to_partitioning.html">Introduction to Partitioning</a></li>
+<li class="toctree-l2"><a class="reference internal" href="partitioning/column_partitioning.html">Column Partitioning</a></li>
+<li class="toctree-l2"><a class="reference internal" href="partitioning/range_partitioning.html">Range Partitioning</a></li>
+<li class="toctree-l2"><a class="reference internal" href="partitioning/hash_partitioning.html">Hash Partitioning</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="backup_and_restore.html">Backup and Restore</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="backup_and_restore/catalog.html">Backup and Restore Catalog</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="hcatalog_integration.html">HCatalog Integration</a></li>
+<li class="toctree-l1"><a class="reference internal" href="jdbc_driver.html">Tajo JDBC Driver</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="jdbc_driver.html#how-to-get-jdbc-driver">How to get JDBC driver</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="jdbc_driver.html#an-example-jdbc-client">An Example JDBC Client</a></li>
+<li class="toctree-l2"><a class="reference internal" href="jdbc_driver.html#faq">FAQ</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="tajo_client_api.html">Tajo Client API</a></li>
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+<li class="toctree-l1"><a class="reference internal" href="sql_language/data_model.html">Data Model</a></li>
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+<li class="toctree-l1"><a class="reference internal" href="sql_language/insert.html">INSERT (OVERWRITE) INTO</a></li>
+<li class="toctree-l1"><a class="reference internal" href="sql_language/queries.html">Queries</a></li>
+<li class="toctree-l1"><a class="reference internal" href="sql_language/sql_expression.html">SQL Expressions</a></li>
+<li class="toctree-l1"><a class="reference internal" href="sql_language/predicates.html">Predicates</a></li>
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\ No newline at end of file
Added: tajo/site/docs/devel/sql_language/data_model.html
URL: http://svn.apache.org/viewvc/tajo/site/docs/devel/sql_language/data_model.html?rev=1644656&view=auto
==============================================================================
--- tajo/site/docs/devel/sql_language/data_model.html (added)
+++ tajo/site/docs/devel/sql_language/data_model.html Thu Dec 11 14:41:20 2014
@@ -0,0 +1,428 @@
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+<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
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+<li class="toctree-l2"><a class="reference internal" href="../getting_started/prerequisites.html">Prerequisites</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../getting_started/downloading_source.html">Dowload and unpack the source code</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../getting_started/building.html">Build source code</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../getting_started/local_setup.html">Setting up a local Tajo cluster</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../getting_started/first_query.html">First query execution</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="../configuration.html">Configuration</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../configuration/preliminary.html">Preliminary</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../configuration/cluster_setup.html">Cluster Setup</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../configuration/tajo_master_configuration.html">Tajo Master Configuration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../configuration/worker_configuration.html">Worker Configuration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../configuration/catalog_configuration.html">Catalog Configuration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../configuration/configuration_defaults.html">Configuration Defaults</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../configuration/ha_configuration.html">High Availability for TajoMaster</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="../tsql.html">Tajo Shell (TSQL)</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../tsql/meta_command.html">Meta Commands</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../tsql/dfs_command.html">Executing HDFS commands</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../tsql/variables.html">Session Variables</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../tsql/admin_command.html">Administration Commands</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../tsql/intro.html">Introducing to TSQL</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../tsql/single_command.html">Executing a single command</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../tsql/execute_file.html">Executing Queries from Files</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../tsql/background_command.html">Executing as background process</a></li>
+</ul>
+</li>
+<li class="toctree-l1 current"><a class="reference internal" href="../sql_language.html">SQL Language</a><ul class="current">
+<li class="toctree-l2 current"><a class="current reference internal" href="">Data Model</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ddl.html">Data Definition Language</a></li>
+<li class="toctree-l2"><a class="reference internal" href="insert.html">INSERT (OVERWRITE) INTO</a></li>
+<li class="toctree-l2"><a class="reference internal" href="queries.html">Queries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sql_expression.html">SQL Expressions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="predicates.html">Predicates</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="../functions.html">Functions</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../functions/math_func_and_operators.html">Math Functions and Operators</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../functions/string_func_and_operators.html">String Functions and Operators</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../functions/datetime_func_and_operators.html">DateTime Functions and Operators</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../functions/network_func_and_operators.html">Network Functions and Operators</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="../table_management.html">Table Management</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../table_management/table_overview.html">Overview of Tajo Tables</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../table_management/file_formats.html">File Formats</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../table_management/compression.html">Compression</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="../table_partitioning.html">Table Partitioning</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../partitioning/intro_to_partitioning.html">Introduction to Partitioning</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../partitioning/column_partitioning.html">Column Partitioning</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../partitioning/range_partitioning.html">Range Partitioning</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../partitioning/hash_partitioning.html">Hash Partitioning</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="../backup_and_restore.html">Backup and Restore</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../backup_and_restore/catalog.html">Backup and Restore Catalog</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="../hcatalog_integration.html">HCatalog Integration</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../jdbc_driver.html">Tajo JDBC Driver</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#how-to-get-jdbc-driver">How to get JDBC driver</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#setting-the-classpath">Setting the CLASSPATH</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#an-example-jdbc-client">An Example JDBC Client</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#faq">FAQ</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="../tajo_client_api.html">Tajo Client API</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../faq.html">FAQ</a></li>
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+<h1>Data Model<a class="headerlink" href="#data-model" title="Permalink to this headline">¶</a></h1>
+<div class="section" id="data-types">
+<h2>Data Types<a class="headerlink" href="#data-types" title="Permalink to this headline">¶</a></h2>
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+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">Support</th>
+<th class="head">SQL Type Name</th>
+<th class="head">Alias</th>
+<th class="head">Size (byte)</th>
+<th class="head">Description</th>
+<th class="head">Range</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>O</td>
+<td>boolean</td>
+<td>bool</td>
+<td>1</td>
+<td> </td>
+<td>true/false</td>
+</tr>
+<tr class="row-odd"><td> </td>
+<td>bit</td>
+<td> </td>
+<td>1</td>
+<td> </td>
+<td>1/0</td>
+</tr>
+<tr class="row-even"><td> </td>
+<td>varbit</td>
+<td>bit varying</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+<tr class="row-odd"><td>O</td>
+<td>smallint</td>
+<td>tinyint, int2</td>
+<td>2</td>
+<td>small-range integer value</td>
+<td>-2^15 (-32,768) to 2^15 (32,767)</td>
+</tr>
+<tr class="row-even"><td>O</td>
+<td>integer</td>
+<td>int, int4</td>
+<td>4</td>
+<td>integer value</td>
+<td>-2^31 (-2,147,483,648) to 2^31 - 1 (2,147,483,647)</td>
+</tr>
+<tr class="row-odd"><td>O</td>
+<td>bigint</td>
+<td>bit varying</td>
+<td>8</td>
+<td>larger range integer value</td>
+<td>-2^63 (-9,223,372,036,854,775,808) to 2^63-1 (9,223,372,036,854,775,807)</td>
+</tr>
+<tr class="row-even"><td>O</td>
+<td>real</td>
+<td>int8</td>
+<td>4</td>
+<td>variable-precision, inexact, real number value</td>
+<td>-3.4028235E+38 to 3.4028235E+38 (6 decimal digits precision)</td>
+</tr>
+<tr class="row-odd"><td>O</td>
+<td>float[(n)]</td>
+<td>float4</td>
+<td>4 or 8</td>
+<td>variable-precision, inexact, real number value</td>
+<td> </td>
+</tr>
+<tr class="row-even"><td>O</td>
+<td>double</td>
+<td>float8, double precision</td>
+<td>8</td>
+<td>variable-precision, inexact, real number value</td>
+<td>1 .7Eâ308 to 1.7E+308 (15 decimal digits precision)</td>
+</tr>
+<tr class="row-odd"><td> </td>
+<td>number</td>
+<td>decimal</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+<tr class="row-even"><td> </td>
+<td>char[(n)]</td>
+<td>character</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+<tr class="row-odd"><td> </td>
+<td>varchar[(n)]</td>
+<td>character varying</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+<tr class="row-even"><td>O</td>
+<td>text</td>
+<td>text</td>
+<td> </td>
+<td>variable-length unicode text</td>
+<td> </td>
+</tr>
+<tr class="row-odd"><td> </td>
+<td>binary</td>
+<td>binary</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+<tr class="row-even"><td> </td>
+<td>varbinary[(n)]</td>
+<td>binary varying</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+<tr class="row-odd"><td>O</td>
+<td>blob</td>
+<td>bytea</td>
+<td> </td>
+<td>variable-length binary string</td>
+<td> </td>
+</tr>
+<tr class="row-even"><td>O</td>
+<td>date</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+<tr class="row-odd"><td>O</td>
+<td>time</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+<tr class="row-even"><td> </td>
+<td>timetz</td>
+<td>time with time zone</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+<tr class="row-odd"><td>O</td>
+<td>timestamp</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+<tr class="row-even"><td> </td>
+<td>timestamptz</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+<tr class="row-odd"><td>O</td>
+<td>inet4</td>
+<td> </td>
+<td>4</td>
+<td>IPv4 address</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<div class="section" id="using-real-number-value-real-and-double">
+<h3>Using real number value (real and double)<a class="headerlink" href="#using-real-number-value-real-and-double" title="Permalink to this headline">¶</a></h3>
+<p>The real and double data types are mapped to float and double of java primitives respectively. Java primitives float and double follows the IEEE 754 specification. So, these types are correctly matched to SQL standard data types.</p>
+<ul class="simple">
+<li>float[( n )] is mapped to either float or double according to a given length n. If n is specified, it must be bewtween 1 and 53. The default value of n is 53.</li>
+<li>If 1 <- n <- 24, a value is mapped to float (6 decimal digits precision).</li>
+<li>If 25 <- n <- 53, a value is mapped to double (15 decimal digits precision).</li>
+<li>Do not use approximate real number columns in WHERE clause in order to compare some exact matches, especially the - and <> operators. The > or < comparisons work well.</li>
+</ul>
+</div>
+</div>
+</div>
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+
+ <div class="section" id="data-definition-language">
+<h1>Data Definition Language<a class="headerlink" href="#data-definition-language" title="Permalink to this headline">¶</a></h1>
+<div class="section" id="create-database">
+<h2>CREATE DATABASE<a class="headerlink" href="#create-database" title="Permalink to this headline">¶</a></h2>
+<p><em>Synopsis</em></p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="k">CREATE</span> <span class="k">DATABASE</span> <span class="p">[</span><span class="n">IF</span> <span class="k">NOT</span> <span class="k">EXISTS</span><span class="p">]</span> <span class="o"><</span><span class="n">database_name</span><span class="o">></span>
+</pre></div>
+</div>
+<p><tt class="docutils literal"><span class="pre">IF</span> <span class="pre">NOT</span> <span class="pre">EXISTS</span></tt> allows <tt class="docutils literal"><span class="pre">CREATE</span> <span class="pre">DATABASE</span></tt> statement to avoid an error which occurs when the database exists.</p>
+</div>
+<div class="section" id="drop-database">
+<h2>DROP DATABASE<a class="headerlink" href="#drop-database" title="Permalink to this headline">¶</a></h2>
+<p><em>Synopsis</em></p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="k">DROP</span> <span class="k">DATABASE</span> <span class="p">[</span><span class="n">IF</span> <span class="k">EXISTS</span><span class="p">]</span> <span class="o"><</span><span class="n">database_name</span><span class="o">></span>
+</pre></div>
+</div>
+<p><tt class="docutils literal"><span class="pre">IF</span> <span class="pre">EXISTS</span></tt> allows <tt class="docutils literal"><span class="pre">DROP</span> <span class="pre">DATABASE</span></tt> statement to avoid an error which occurs when the database does not exist.</p>
+</div>
+<div class="section" id="create-table">
+<h2>CREATE TABLE<a class="headerlink" href="#create-table" title="Permalink to this headline">¶</a></h2>
+<p><em>Synopsis</em></p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="p">[</span><span class="n">IF</span> <span class="k">NOT</span> <span class="k">EXISTS</span><span class="p">]</span> <span class="o"><</span><span class="k">table_name</span><span class="o">></span> <span class="p">[(</span><span class="o"><</span><span class="k">column_name</span><span class="o">></span> <span class="o"><</span><span class="n">data_type</span><span class="o">></span><span class="p">,</span> <span class="p">...</span> <span class="p">)]</span>
+<span class="p">[</span><span class="k">using</span> <span class="o"><</span><span class="n">storage_type</span><span class="o">></span> <span class="p">[</span><span class="k">with</span> <span class="p">(</span><span class="o"><</span><span class="k">key</span><span class="o">></span> <span class="o">=</span> <span class="o"><</span><span class="n">value</span><span class="o">></span><span class="p">,</span> <span class="p">...)]]</span> <span class="p">[</span><span class="k">AS</span> <span class="o"><</span><span class="n">select_statement</span><span class="o">></span><span class="p">]</span>
+
+<span class="k">CREATE</span> <span class="k">EXTERNAL</span> <span class="k">TABLE</span> <span class="p">[</span><span class="n">IF</span> <span class="k">NOT</span> <span class="k">EXISTS</span><span class="p">]</span> <span class="o"><</span><span class="k">table_name</span><span class="o">></span> <span class="p">(</span><span class="o"><</span><span class="k">column_name</span><span class="o">></span> <span class="o"><</span><span class="n">data_type</span><span class="o">></span><span class="p">,</span> <span class="p">...</span> <span class="p">)</span>
+<span class="k">using</span> <span class="o"><</span><span class="n">storage_type</span><span class="o">></span> <span class="p">[</span><span class="k">with</span> <span class="p">(</span><span class="o"><</span><span class="k">key</span><span class="o">></span> <span class="o">=</span> <span class="o"><</span><span class="n">value</span><span class="o">></span><span class="p">,</span> <span class="p">...)]</span> <span class="k">LOCATION</span> <span class="s1">'<path>'</span>
+</pre></div>
+</div>
+<p><tt class="docutils literal"><span class="pre">IF</span> <span class="pre">NOT</span> <span class="pre">EXISTS</span></tt> allows <tt class="docutils literal"><span class="pre">CREATE</span> <span class="pre">[EXTERNAL]</span> <span class="pre">TABLE</span></tt> statement to avoid an error which occurs when the table does not exist.</p>
+<div class="section" id="compression">
+<h3>Compression<a class="headerlink" href="#compression" title="Permalink to this headline">¶</a></h3>
+<p>If you want to add an external table that contains compressed data, you should give ‘compression.code’ parameter to CREATE TABLE statement.</p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="k">create</span> <span class="k">EXTERNAL</span> <span class="k">table</span> <span class="n">lineitem</span> <span class="p">(</span>
+<span class="n">L_ORDERKEY</span> <span class="nb">bigint</span><span class="p">,</span>
+<span class="n">L_PARTKEY</span> <span class="nb">bigint</span><span class="p">,</span>
+<span class="p">...</span>
+<span class="n">L_COMMENT</span> <span class="nb">text</span><span class="p">)</span>
+
+<span class="k">USING</span> <span class="n">csv</span> <span class="k">WITH</span> <span class="p">(</span><span class="s1">'text.delimiter'</span><span class="o">=</span><span class="s1">'|'</span><span class="p">,</span><span class="s1">'compression.codec'</span><span class="o">=</span><span class="s1">'org.apache.hadoop.io.compress.DeflateCodec'</span><span class="p">)</span>
+<span class="k">LOCATION</span> <span class="s1">'hdfs://localhost:9010/tajo/warehouse/lineitem_100_snappy'</span><span class="p">;</span>
+</pre></div>
+</div>
+<dl class="docutils">
+<dt><cite>compression.codec</cite> parameter can have one of the following compression codecs:</dt>
+<dd><ul class="first last simple">
+<li>org.apache.hadoop.io.compress.BZip2Codec</li>
+<li>org.apache.hadoop.io.compress.DeflateCodec</li>
+<li>org.apache.hadoop.io.compress.GzipCodec</li>
+<li>org.apache.hadoop.io.compress.SnappyCodec</li>
+</ul>
+</dd>
+</dl>
+</div>
+</div>
+<div class="section" id="drop-table">
+<h2>DROP TABLE<a class="headerlink" href="#drop-table" title="Permalink to this headline">¶</a></h2>
+<p><em>Synopsis</em></p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="k">DROP</span> <span class="k">TABLE</span> <span class="p">[</span><span class="n">IF</span> <span class="k">EXISTS</span><span class="p">]</span> <span class="o"><</span><span class="k">table_name</span><span class="o">></span> <span class="p">[</span><span class="n">PURGE</span><span class="p">]</span>
+</pre></div>
+</div>
+<p><tt class="docutils literal"><span class="pre">IF</span> <span class="pre">EXISTS</span></tt> allows <tt class="docutils literal"><span class="pre">DROP</span> <span class="pre">DATABASE</span></tt> statement to avoid an error which occurs when the database does not exist. <tt class="docutils literal"><span class="pre">DROP</span> <span class="pre">TABLE</span></tt> statement removes a table from Tajo catalog, but it does not remove the contents. If <tt class="docutils literal"><span class="pre">PURGE</span></tt> option is given, <tt class="docutils literal"><span class="pre">DROP</span> <span class="pre">TABLE</span></tt> statement will eliminate the entry in the catalog as well as the contents.</p>
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+ <div class="section" id="insert-overwrite-into">
+<h1>INSERT (OVERWRITE) INTO<a class="headerlink" href="#insert-overwrite-into" title="Permalink to this headline">¶</a></h1>
+<p>INSERT OVERWRITE statement overwrites a table data of an existing table or a data in a given directory. Tajo’s INSERT OVERWRITE statement follows <tt class="docutils literal"><span class="pre">INSERT</span> <span class="pre">INTO</span> <span class="pre">SELECT</span></tt> statement of SQL. The examples are as follows:</p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="k">create</span> <span class="k">table</span> <span class="n">t1</span> <span class="p">(</span><span class="n">col1</span> <span class="nb">int8</span><span class="p">,</span> <span class="n">col2</span> <span class="n">int4</span><span class="p">,</span> <span class="n">col3</span> <span class="n">float8</span><span class="p">);</span>
+
+<span class="c1">-- when a target table schema and output schema are equivalent to each other</span>
+<span class="k">INSERT</span> <span class="n">OVERWRITE</span> <span class="k">INTO</span> <span class="n">t1</span> <span class="k">SELECT</span> <span class="n">l_orderkey</span><span class="p">,</span> <span class="n">l_partkey</span><span class="p">,</span> <span class="n">l_quantity</span> <span class="k">FROM</span> <span class="n">lineitem</span><span class="p">;</span>
+<span class="c1">-- or</span>
+<span class="k">INSERT</span> <span class="n">OVERWRITE</span> <span class="k">INTO</span> <span class="n">t1</span> <span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">lineitem</span><span class="p">;</span>
+
+<span class="c1">-- when the output schema are smaller than the target table schema</span>
+<span class="k">INSERT</span> <span class="n">OVERWRITE</span> <span class="k">INTO</span> <span class="n">t1</span> <span class="k">SELECT</span> <span class="n">l_orderkey</span> <span class="k">FROM</span> <span class="n">lineitem</span><span class="p">;</span>
+
+<span class="c1">-- when you want to specify certain target columns</span>
+<span class="k">INSERT</span> <span class="n">OVERWRITE</span> <span class="k">INTO</span> <span class="n">t1</span> <span class="p">(</span><span class="n">col1</span><span class="p">,</span> <span class="n">col3</span><span class="p">)</span> <span class="k">SELECT</span> <span class="n">l_orderkey</span><span class="p">,</span> <span class="n">l_quantity</span> <span class="k">FROM</span> <span class="n">lineitem</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>In addition, INSERT OVERWRITE statement overwrites table data as well as a specific directory.</p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="k">INSERT</span> <span class="n">OVERWRITE</span> <span class="k">INTO</span> <span class="k">LOCATION</span> <span class="s1">'/dir/subdir'</span> <span class="k">SELECT</span> <span class="n">l_orderkey</span><span class="p">,</span> <span class="n">l_quantity</span> <span class="k">FROM</span> <span class="n">lineitem</span><span class="p">;</span>
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+ <div class="section" id="predicates">
+<h1>Predicates<a class="headerlink" href="#predicates" title="Permalink to this headline">¶</a></h1>
+<div class="section" id="in-predicate">
+<h2>IN Predicate<a class="headerlink" href="#in-predicate" title="Permalink to this headline">¶</a></h2>
+<p>IN predicate provides row and array comparison.</p>
+<p><em>Synopsis</em></p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="n">column_reference</span> <span class="k">IN</span> <span class="p">(</span><span class="n">val1</span><span class="p">,</span> <span class="n">val2</span><span class="p">,</span> <span class="p">...,</span> <span class="n">valN</span><span class="p">)</span>
+<span class="n">column_reference</span> <span class="k">NOT</span> <span class="k">IN</span> <span class="p">(</span><span class="n">val1</span><span class="p">,</span> <span class="n">val2</span><span class="p">,</span> <span class="p">...,</span> <span class="n">valN</span><span class="p">)</span>
+</pre></div>
+</div>
+<p>Examples are as follows:</p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="c1">-- this statement filters lists down all the records where col1 value is 1, 2 or 3:</span>
+<span class="k">SELECT</span> <span class="n">col1</span><span class="p">,</span> <span class="n">col2</span> <span class="k">FROM</span> <span class="n">table1</span> <span class="k">WHERE</span> <span class="n">col1</span> <span class="k">IN</span> <span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">);</span>
+
+<span class="c1">-- this statement filters lists down all the records where col1 value is neither 1, 2 nor 3:</span>
+<span class="k">SELECT</span> <span class="n">col1</span><span class="p">,</span> <span class="n">col2</span> <span class="k">FROM</span> <span class="n">table1</span> <span class="k">WHERE</span> <span class="n">col1</span> <span class="k">NOT</span> <span class="k">IN</span> <span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>You can use ‘IN clause’ on text data domain as follows:</p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="k">SELECT</span> <span class="n">col1</span><span class="p">,</span> <span class="n">col2</span> <span class="k">FROM</span> <span class="n">table1</span> <span class="k">WHERE</span> <span class="n">col2</span> <span class="k">IN</span> <span class="p">(</span><span class="s1">'tajo'</span><span class="p">,</span> <span class="s1">'hadoop'</span><span class="p">);</span>
+
+<span class="k">SELECT</span> <span class="n">col1</span><span class="p">,</span> <span class="n">col2</span> <span class="k">FROM</span> <span class="n">table1</span> <span class="k">WHERE</span> <span class="n">col2</span> <span class="k">NOT</span> <span class="k">IN</span> <span class="p">(</span><span class="s1">'tajo'</span><span class="p">,</span> <span class="s1">'hadoop'</span><span class="p">);</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="string-pattern-matching-predicates">
+<h2>String Pattern Matching Predicates<a class="headerlink" href="#string-pattern-matching-predicates" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="like">
+<h3>LIKE<a class="headerlink" href="#like" title="Permalink to this headline">¶</a></h3>
+<p>LIKE operator returns true or false depending on whether its pattern matches the given string. An underscore (_) in pattern matches any single character. A percent sign (%) matches any sequence of zero or more characters.</p>
+<p><em>Synopsis</em></p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="n">string</span> <span class="k">LIKE</span> <span class="n">pattern</span>
+<span class="n">string</span> <span class="k">NOT</span> <span class="k">LIKE</span> <span class="n">pattern</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="ilike">
+<h3>ILIKE<a class="headerlink" href="#ilike" title="Permalink to this headline">¶</a></h3>
+<p>ILIKE is the same to LIKE, but it is a case insensitive operator. It is not in the SQL standard. We borrow this operator from PostgreSQL.</p>
+<p><em>Synopsis</em></p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="n">string</span> <span class="k">ILIKE</span> <span class="n">pattern</span>
+<span class="n">string</span> <span class="k">NOT</span> <span class="k">ILIKE</span> <span class="n">pattern</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="similar-to">
+<h3>SIMILAR TO<a class="headerlink" href="#similar-to" title="Permalink to this headline">¶</a></h3>
+<p><em>Synopsis</em></p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="n">string</span> <span class="k">SIMILAR</span> <span class="k">TO</span> <span class="n">pattern</span>
+<span class="n">string</span> <span class="k">NOT</span> <span class="k">SIMILAR</span> <span class="k">TO</span> <span class="n">pattern</span>
+</pre></div>
+</div>
+<p>It returns true or false depending on whether its pattern matches the given string. Also like LIKE, <tt class="docutils literal"><span class="pre">SIMILAR</span> <span class="pre">TO</span></tt> uses <tt class="docutils literal"><span class="pre">_</span></tt> and <tt class="docutils literal"><span class="pre">%</span></tt> as metacharacters denoting any single character and any string, respectively.</p>
+<p>In addition to these metacharacters borrowed from LIKE, ‘SIMILAR TO’ supports more powerful pattern-matching metacharacters borrowed from regular expressions:</p>
+<table border="1" class="docutils">
+<colgroup>
+<col width="21%" />
+<col width="79%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">metacharacter</th>
+<th class="head">description</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>&#124;</td>
+<td>denotes alternation (either of two alternatives).</td>
+</tr>
+<tr class="row-odd"><td><ul class="first last simple">
+<li></li>
+</ul>
+</td>
+<td>denotes repetition of the previous item zero or more times.</td>
+</tr>
+<tr class="row-even"><td><ul class="first last simple">
+<li></li>
+</ul>
+</td>
+<td>denotes repetition of the previous item one or more times.</td>
+</tr>
+<tr class="row-odd"><td>?</td>
+<td>denotes repetition of the previous item zero or one time.</td>
+</tr>
+<tr class="row-even"><td>{m}</td>
+<td>denotes repetition of the previous item exactly m times.</td>
+</tr>
+<tr class="row-odd"><td>{m,}</td>
+<td>denotes repetition of the previous item m or more times.</td>
+</tr>
+<tr class="row-even"><td>{m,n}</td>
+<td>denotes repetition of the previous item at least m and not more than n times.</td>
+</tr>
+<tr class="row-odd"><td>[]</td>
+<td>A bracket expression specifies a character class, just as in POSIX regular expressions.</td>
+</tr>
+<tr class="row-even"><td>()</td>
+<td>Parentheses can be used to group items into a single logical item.</td>
+</tr>
+</tbody>
+</table>
+<p>Note that <cite>.`</cite> is not used as a metacharacter in <tt class="docutils literal"><span class="pre">SIMILAR</span> <span class="pre">TO</span></tt> operator.</p>
+</div>
+<div class="section" id="regular-expressions">
+<h3>Regular expressions<a class="headerlink" href="#regular-expressions" title="Permalink to this headline">¶</a></h3>
+<p>Regular expressions provide a very powerful means for string pattern matching. In the current Tajo, regular expressions are based on Java-style regular expressions instead of POSIX regular expression. The main difference between java-style one and POSIX’s one is character class.</p>
+<p><em>Synopsis</em></p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="n">string</span> <span class="o">~</span> <span class="n">pattern</span>
+<span class="n">string</span> <span class="o">!~</span> <span class="n">pattern</span>
+
+<span class="n">string</span> <span class="o">~*</span> <span class="n">pattern</span>
+<span class="n">string</span> <span class="o">!~*</span> <span class="n">pattern</span>
+</pre></div>
+</div>
+<table border="1" class="docutils">
+<colgroup>
+<col width="9%" />
+<col width="91%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">operator</th>
+<th class="head">Description</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>~</td>
+<td>It returns true if a given regular expression is matched to string. Otherwise, it returns false.</td>
+</tr>
+<tr class="row-odd"><td>!~</td>
+<td>It returns false if a given regular expression is matched to string. Otherwise, it returns true.</td>
+</tr>
+<tr class="row-even"><td>~*</td>
+<td>It is the same to ‘~’, but it is case insensitive.</td>
+</tr>
+<tr class="row-odd"><td>!~*</td>
+<td>It is the same to ‘!~’, but it is case insensitive.</td>
+</tr>
+</tbody>
+</table>
+<p>Here are examples:</p>
+<div class="highlight-sql"><div class="highlight"><pre>'abc' ~ '.*c' true
+'abc' ~ 'c' false
+'aaabc' ~ '([a-z]){3}bc true
+'abc' ~* '.*C' true
+'abc' !~* 'B.*' true
+</pre></div>
+</div>
+<p>Regular expressions operator is not in the SQL standard. We borrow this operator from PostgreSQL.</p>
+<p><em>Synopsis for REGEXP and RLIKE operators</em></p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="n">string</span> <span class="n">REGEXP</span> <span class="n">pattern</span>
+<span class="n">string</span> <span class="k">NOT</span> <span class="n">REGEXP</span> <span class="n">pattern</span>
+
+<span class="n">string</span> <span class="n">RLIKE</span> <span class="n">pattern</span>
+<span class="n">string</span> <span class="k">NOT</span> <span class="n">RLIKE</span> <span class="n">pattern</span>
+</pre></div>
+</div>
+<p>But, they do not support case-insensitive operators.</p>
+</div>
+</div>
+</div>
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