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Posted to commits@drill.apache.org by kr...@apache.org on 2015/12/06 17:54:57 UTC
[31/51] [partial] drill-site git commit: Website update
http://git-wip-us.apache.org/repos/asf/drill-site/blob/bbdefcb2/_site/docs/aggregate-and-aggregate-statistical/index.html
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+ <li class="toctree-l1"><a href="javascript: void(0);">Connect a Data Source</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/drill-default-input-format/">Drill Default Input Format</a></li>
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+ </ul>
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+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/s3-storage-plugin/">S3 Storage Plugin</a></li>
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+ <li class="toctree-l1"><a href="javascript: void(0);">ODBC/JDBC Interfaces</a></li>
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+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/interfaces-introduction/">Interfaces Introduction</a></li>
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+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/using-the-jdbc-driver/">Using the JDBC Driver</a></li>
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+
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+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/using-jdbc-with-squirrel-on-windows/">Using JDBC with SQuirreL on Windows</a></li>
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+
+ <li class="toctree-l2"><a href="javascript: void(0);">Installing the ODBC Driver</a></li>
+ <ul style="display: none">
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/installing-the-driver-on-linux/">Installing the Driver on Linux</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/installing-the-driver-on-mac-os-x/">Installing the Driver on Mac OS X</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/installing-the-driver-on-windows/">Installing the Driver on Windows</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/installing-the-tdc-file-on-windows/">Installing the TDC File on Windows</a></li>
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+ <li class="toctree-l2"><a href="javascript: void(0);">Configuring ODBC</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/odbc-configuration-reference/">ODBC Configuration Reference</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/configuring-odbc-on-linux/">Configuring ODBC on Linux</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/configuring-odbc-on-mac-os-x/">Configuring ODBC on Mac OS X</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/configuring-odbc-on-windows/">Configuring ODBC on Windows</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/testing-the-odbc-connection/">Testing the ODBC Connection</a></li>
+
+ </ul>
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+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Using Drill Explorer</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/drill-explorer-introduction/">Drill Explorer Introduction</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/connecting-drill-explorer-to-data/">Connecting Drill Explorer to Data</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/browsing-data-and-defining-views/">Browsing Data and Defining Views</a></li>
+
+ </ul>
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+ <li class="toctree-l2"><a href="javascript: void(0);">Using Drill with BI Tools</a></li>
+ <ul style="display: none">
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/using-drill-with-bi-tools-introduction/">Using Drill with BI Tools Introduction</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/tableau-examples/">Tableau Examples</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/using-microstrategy-analytics-with-apache-drill/">Using MicroStrategy Analytics with Apache Drill</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/using-tibco-spotfire-desktop-with-drill/">Using Tibco Spotfire Desktop with Drill</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/configuring-tibco-spotfire-server-with-drill/">Configuring Tibco Spotfire Server with Drill</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/using-qlik-sense-with-drill/">Using Qlik Sense with Drill</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/using-apache-drill-with-tableau-9-desktop/">Using Apache Drill with Tableau 9 Desktop</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/using-apache-drill-with-tableau-9-server/">Using Apache Drill with Tableau 9 Server</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/configuring-jreport-with-drill/">Configuring JReport with Drill</a></li>
+
+ </ul>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Query Data</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/query-data-introduction/">Query Data Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Querying a File System</a></li>
+ <ul style="display: none">
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/querying-a-file-system-introduction/">Querying a File System Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/querying-json-files/">Querying JSON Files</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/querying-parquet-files/">Querying Parquet Files</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/querying-plain-text-files/">Querying Plain Text Files</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/querying-directories/">Querying Directories</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/querying-sequence-files/">Querying Sequence Files</a></li>
+
+ </ul>
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+
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+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/querying-hbase/">Querying HBase</a></li>
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+ <li class="toctree-l2"><a href="javascript: void(0);">Querying Complex Data</a></li>
+ <ul style="display: none">
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/querying-complex-data-introduction/">Querying Complex Data Introduction</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/sample-data-donuts/">Sample Data: Donuts</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/selecting-flat-data/">Selecting Flat Data</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/using-sql-functions-clauses-and-joins/">Using SQL Functions, Clauses, and Joins</a></li>
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+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/selecting-nested-data-for-a-column/">Selecting Nested Data for a Column</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/selecting-multiple-columns-within-nested-data/">Selecting Multiple Columns Within Nested Data</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/querying-hive/">Querying Hive</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/querying-the-information-schema/">Querying the INFORMATION SCHEMA</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/querying-system-tables/">Querying System Tables</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/monitoring-and-canceling-queries-in-the-drill-web-console/">Monitoring and Canceling Queries in the Drill Web Console</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Performance Tuning</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/performance-tuning-introduction/">Performance Tuning Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/partition-pruning/">Partition Pruning</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/optimizing-parquet-metadata-reading/">Optimizing Parquet Metadata Reading</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/choosing-a-storage-format/">Choosing a Storage Format</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Query Plans and Tuning</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/query-plans-and-tuning-introduction/">Query Plans and Tuning Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/join-planning-guidelines/">Join Planning Guidelines</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/guidelines-for-optimizing-aggregation/">Guidelines for Optimizing Aggregation</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/modifying-query-planning-options/">Modifying Query Planning Options</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/sort-based-and-hash-based-memory-constrained-operators/">Sort-Based and Hash-Based Memory-Constrained Operators</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Identifying Performance Issues</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/query-plans/">Query Plans</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/query-profiles/">Query Profiles</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Performance Tuning Reference</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/query-profile-column-descriptions/">Query Profile Column Descriptions</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/physical-operators/">Physical Operators</a></li>
+
+ </ul>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Log and Debug</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/log-and-debug-introduction/">Log and Debug Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/error-messages/">Error Messages</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/modify-logback-xml/">Modify logback.xml</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/review-the-java-stack-trace/">Review the Java Stack Trace</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/query-audit-logging/">Query Audit Logging</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1 current_section "><a href="javascript: void(0);">SQL Reference</a></li>
+ <ul class="current_section">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/sql-reference-introduction/">SQL Reference Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Data Types</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/supported-data-types/">Supported Data Types</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/date-time-and-timestamp/">Date, Time, and Timestamp</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/handling-different-data-types/">Handling Different Data Types</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/lexical-structure/">Lexical Structure</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/operators/">Operators</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">SQL Functions</a></li>
+ <ul style="">
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/about-sql-function-examples/">About SQL Function Examples</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/math-and-trig/">Math and Trig</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/data-type-conversion/">Data Type Conversion</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/date-time-functions-and-arithmetic/">Date/Time Functions and Arithmetic</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/string-manipulation/">String Manipulation</a></li>
+
+ <li class="toctree-l3 current"><a class="reference internal" href="/drill/docs/aggregate-and-aggregate-statistical/">Aggregate and Aggregate Statistical</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/functions-for-handling-nulls/">Functions for Handling Nulls</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">SQL Window Functions</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/sql-window-functions-introduction/">SQL Window Functions Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/aggregate-window-functions/">Aggregate Window Functions</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/ranking-window-functions/">Ranking Window Functions</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/value-window-functions/">Value Window Functions</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/sql-window-functions-examples/">SQL Window Functions Examples</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Nested Data Functions</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/nested-data-limitations/">Nested Data Limitations</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/flatten/">FLATTEN</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/kvgen/">KVGEN</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/repeated-count/">REPEATED_COUNT</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/repeated-contains/">REPEATED_CONTAINS</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/query-directory-functions/">Query Directory Functions</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">SQL Commands</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/supported-sql-commands/">Supported SQL Commands</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/alter-session/">ALTER SESSION</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/alter-system/">ALTER SYSTEM</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/create-table-as-ctas/">CREATE TABLE AS (CTAS)</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/partition-by-clause/">PARTITION BY Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/create-view/">CREATE VIEW</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/describe/">DESCRIBE</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/drop-table/">DROP TABLE</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/drop-view/">DROP VIEW</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/explain/">EXPLAIN</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/select/">SELECT</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/select-list/">SELECT List</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/from-clause/">FROM Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/group-by-clause/">GROUP BY Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/having-clause/">HAVING Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/limit-clause/">LIMIT Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/offset-clause/">OFFSET Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/order-by-clause/">ORDER BY Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/union-set-operator/">UNION Set Operator</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/where-clause/">WHERE Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/with-clause/">WITH Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/show-databases-and-show-schemas/">SHOW DATABASES and SHOW SCHEMAS</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/show-files/">SHOW FILES</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/show-tables/">SHOW TABLES</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/use/">USE</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">SQL Conditional Expressions</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/case/">CASE</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/reserved-keywords/">Reserved Keywords</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/sql-extensions/">SQL Extensions</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Data Sources and File Formats</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/data-sources-and-file-formats-introduction/">Data Sources and File Formats Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/hive-to-drill-data-type-mapping/">Hive-to-Drill Data Type Mapping</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/deploying-and-using-a-hive-udf/">Deploying and Using a Hive UDF</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/parquet-format/">Parquet Format</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/json-data-model/">JSON Data Model</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/text-files-csv-tsv-psv/">Text Files: CSV, TSV, PSV</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/sequence-files/">Sequence Files</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Develop Custom Functions</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/develop-custom-functions-introduction/">Develop Custom Functions Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/developing-a-simple-function/">Developing a Simple Function</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/tutorial-develop-a-simple-function/">Tutorial: Develop a Simple Function</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/developing-an-aggregate-function/">Developing an Aggregate Function</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/adding-custom-functions-to-drill/">Adding Custom Functions to Drill</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/using-custom-functions-in-queries/">Using Custom Functions in Queries</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/custom-function-interfaces/">Custom Function Interfaces</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a class="reference internal" href="/drill/docs/troubleshooting/">Troubleshooting</a></li>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Developer Information</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/rest-api/">REST API</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Develop Drill</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/compiling-drill-from-source/">Compiling Drill from Source</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/drill-patch-review-tool/">Drill Patch Review Tool</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Contribute to Drill</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/apache-drill-contribution-guidelines/">Apache Drill Contribution Guidelines</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/apache-drill-contribution-ideas/">Apache Drill Contribution Ideas</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Design Docs</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/drill-plan-syntax/">Drill Plan Syntax</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/rpc-overview/">RPC Overview</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/query-stages/">Query Stages</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/useful-research/">Useful Research</a></li>
+
+ <li class="toctree-l3"><a class="reference internal" href="/drill/docs/value-vectors/">Value Vectors</a></li>
+
+ </ul>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Release Notes</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/apache-drill-1-3-0-release-notes/">Apache Drill 1.3.0 Release Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/apache-drill-1-2-0-release-notes/">Apache Drill 1.2.0 Release Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/apache-drill-1-1-0-release-notes/">Apache Drill 1.1.0 Release Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/apache-drill-1-0-0-release-notes/">Apache Drill 1.0.0 Release Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/apache-drill-0-9-0-release-notes/">Apache Drill 0.9.0 Release Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/apache-drill-0-8-0-release-notes/">Apache Drill 0.8.0 Release Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/apache-drill-0-7-0-release-notes/">Apache Drill 0.7.0 Release Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/apache-drill-0-6-0-release-notes/">Apache Drill 0.6.0 Release Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/apache-drill-m1-release-notes-apache-drill-alpha/">Apache Drill M1 Release Notes (Apache Drill Alpha)</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/apache-drill-m1-release-notes-apache-drill-alpha/">Apache Drill M1 Release Notes (Apache Drill Alpha)</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/apache-drill-0-5-0-release-notes/">Apache Drill 0.5.0 Release Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/apache-drill-0-4-0-release-notes/">Apache Drill 0.4.0 Release Notes</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Sample Datasets</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/aol-search/">AOL Search</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/enron-emails/">Enron Emails</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal" href="/drill/docs/wikipedia-edit-history/">Wikipedia Edit History</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a class="reference internal" href="/drill/docs/project-bylaws/">Project Bylaws</a></li>
+
+
+ </ul>
+
+ </div>
+ </div>
+</aside>
+
+
+<nav class="breadcrumbs">
+ <li><a href="/drill/docs/">Docs</a></li>
+
+
+ <li><a href="/drill/docs/sql-reference/">SQL Reference</a></li>
+
+ <li><a href="/drill/docs/sql-functions/">SQL Functions</a></li>
+
+ <li>Aggregate and Aggregate Statistical</li>
+</nav>
+
+<div class="main-content-wrapper">
+ <div class="main-content">
+
+
+ <a class="edit-link" href="https://github.com/apache/drill/blob/gh-pages/_docs/sql-reference/sql-functions/050-aggregate-and-aggregate-statistical.md" target="_blank"><i class="fa fa-pencil-square-o"></i></a>
+
+
+ <div class="int_title left">
+ <h1>Aggregate and Aggregate Statistical</h1>
+
+ </div>
+
+ <link href="/drill/css/docpage.css" rel="stylesheet" type="text/css">
+
+ <div class="int_text" align="left">
+
+ <h2 id="aggregate-functions">Aggregate Functions</h2>
+
+<p>The following tables list the aggregate and aggregate statistical functions that you can use in
+Drill queries:</p>
+
+<table><thead>
+<tr>
+<th><strong>Function</strong></th>
+<th><strong>Argument Type</strong></th>
+<th><strong>Return Type</strong></th>
+</tr>
+</thead><tbody>
+<tr>
+<td>AVG(expression)</td>
+<td>SMALLINT, INTEGER, BIGINT, FLOAT, DOUBLE, DECIMAL, INTERVAL</td>
+<td>DECIMAL for any integer-type argument, DOUBLE for a floating-point argument, otherwise the same as the argument data type</td>
+</tr>
+<tr>
+<td>COUNT(*)</td>
+<td><em>-</em></td>
+<td>BIGINT</td>
+</tr>
+<tr>
+<td>COUNT([DISTINCT] expression)</td>
+<td>any</td>
+<td>BIGINT</td>
+</tr>
+<tr>
+<td>MAX(expression)</td>
+<td>BINARY, DECIMAL, VARCHAR, DATE, TIME, or TIMESTAMP</td>
+<td>same as argument type</td>
+</tr>
+<tr>
+<td>MIN(expression)</td>
+<td>BINARY, DECIMAL, VARCHAR, DATE, TIME, or TIMESTAMP</td>
+<td>same as argument type</td>
+</tr>
+<tr>
+<td>SUM(expression)</td>
+<td>SMALLINT, INTEGER, BIGINT, FLOAT, DOUBLE, DECIMAL, INTERVAL</td>
+<td>BIGINT for SMALLINT or INTEGER arguments, DECIMAL for BIGINT arguments, DOUBLE for floating-point arguments, otherwise the same as the argument data type</td>
+</tr>
+</tbody></table>
+
+<p>* In this release, Drill disables the DECIMAL data type, including casting to DECIMAL and reading DECIMAL types from Parquet and Hive. You can <a href="docs/supported-data-types/#enabling-the-decimal-type">enable the DECIMAL type</a>, but this is not recommended.</p>
+
+<p>AVG, COUNT, MIN, MAX, and SUM accept ALL and DISTINCT keywords. The default is ALL.</p>
+
+<p>These examples of aggregate functions use the <code>cp</code> storage plugin to access a the <a href="/drill/docs/querying-json-files/"><code>employee.json</code></a> file installed with Drill. By default, JSON reads numbers as double-precision floating point numbers. These examples assume that you are using the default option <a href="/drill/docs/json-data-model/#handling-type-differences">all_text_mode</a> set to false.</p>
+
+<h2 id="avg">AVG</h2>
+
+<p>Averages a column of all records in a data source. Averages a column of one or more groups of records. Which records to include in the calculation can be based on a condition.</p>
+
+<h3 id="avg-syntax">AVG Syntax</h3>
+<div class="highlight"><pre><code class="language-text" data-lang="text">SELECT AVG([ALL | DISTINCT] aggregate_expression)
+FROM tables
+WHERE conditions;
+
+SELECT expression1, expression2, ... expression_n,
+ AVG([ALL | DISTINCT] aggregate_expression)
+FROM tables
+WHERE conditions
+GROUP BY expression1, expression2, ... expression_n;
+</code></pre></div>
+<p>Expressions listed within the AVG function and must be included in the GROUP BY clause. </p>
+
+<h3 id="avg-examples">AVG Examples</h3>
+<div class="highlight"><pre><code class="language-text" data-lang="text">ALTER SESSION SET `store.json.all_text_mode` = false;
++-------+------------------------------------+
+| ok | summary |
++-------+------------------------------------+
+| true | store.json.all_text_mode updated. |
++-------+------------------------------------+
+1 row selected (0.073 seconds)
+</code></pre></div>
+<p>Take a look at the salaries of employees having IDs 1139, 1140, and 1141. These are the salaries that subsequent examples will average and sum.</p>
+<div class="highlight"><pre><code class="language-text" data-lang="text">SELECT * FROM cp.`employee.json` WHERE employee_id IN (1139, 1140, 1141);
++--------------+------------------+-------------+------------+--------------+--------------------------+-----------+----------------+-------------+------------------------+-------------+----------------+------------------+-----------------+---------+-----------------------+
+| employee_id | full_name | first_name | last_name | position_id | position_title | store_id | department_id | birth_date | hire_date | salary | supervisor_id | education_level | marital_status | gender | management_role |
++--------------+------------------+-------------+------------+--------------+--------------------------+-----------+----------------+-------------+------------------------+-------------+----------------+------------------+-----------------+---------+-----------------------+
+| 1139 | Jeanette Belsey | Jeanette | Belsey | 12 | Store Assistant Manager | 18 | 11 | 1972-05-12 | 1998-01-01 00:00:00.0 | 10000.0000 | 17 | Graduate Degree | S | M | Store Management |
+| 1140 | Mona Jaramillo | Mona | Jaramillo | 13 | Store Shift Supervisor | 18 | 11 | 1961-09-24 | 1998-01-01 00:00:00.0 | 8900.0000 | 1139 | Partial College | S | M | Store Management |
+| 1141 | James Compagno | James | Compagno | 15 | Store Permanent Checker | 18 | 15 | 1914-02-02 | 1998-01-01 00:00:00.0 | 6400.0000 | 1139 | Graduate Degree | S | M | Store Full Time Staf |
++--------------+------------------+-------------+------------+--------------+--------------------------+-----------+----------------+-------------+------------------------+-------------+----------------+------------------+-----------------+---------+-----------------------+
+3 rows selected (0.284 seconds)
+</code></pre></div><div class="highlight"><pre><code class="language-text" data-lang="text">SELECT AVG(salary) FROM cp.`employee.json` WHERE employee_id IN (1139, 1140, 1141);
++--------------------+
+| EXPR$0 |
++--------------------+
+| 8433.333333333334 |
++--------------------+
+1 row selected (0.208 seconds)
+
+SELECT AVG(ALL salary) FROM cp.`employee.json` WHERE employee_id IN (1139, 1140, 1141);
++--------------------+
+| EXPR$0 |
++--------------------+
+| 8433.333333333334 |
++--------------------+
+1 row selected (0.17 seconds)
+
+SELECT AVG(DISTINCT salary) FROM cp.`employee.json`;
++---------------------+
+| EXPR$0 |
++---------------------+
+| 12773.333333333334 |
++---------------------+
+1 row selected (0.384 seconds)
+</code></pre></div><div class="highlight"><pre><code class="language-text" data-lang="text">SELECT education_level, AVG(salary) FROM cp.`employee.json` GROUP BY education_level;
++----------------------+---------------------+
+| education_level | EXPR$1 |
++----------------------+---------------------+
+| Graduate Degree | 4392.823529411765 |
+| Bachelors Degree | 4492.404181184669 |
+| Partial College | 4047.1180555555557 |
+| High School Degree | 3516.1565836298932 |
+| Partial High School | 3511.0852713178297 |
++----------------------+---------------------+
+5 rows selected (0.495 seconds)
+</code></pre></div>
+<h2 id="count">COUNT</h2>
+
+<p>Returns the number of rows that match the given criteria.</p>
+
+<h3 id="count-syntax">COUNT Syntax</h3>
+
+<p><code>SELECT COUNT([DISTINCT | ALL] column) FROM . . .</code><br>
+<code>SELECT COUNT(*) FROM . . .</code> </p>
+
+<ul>
+<li>column<br>
+Returns the number of values of the specified column.<br></li>
+<li>DISTINCT column<br>
+Returns the number of distinct values in the column.<br></li>
+<li>ALL column<br>
+Returns the number of values of the specified column.<br></li>
+<li>* (asterisk)
+Returns the number of records in the table.</li>
+</ul>
+
+<h3 id="count-examples">COUNT Examples</h3>
+<div class="highlight"><pre><code class="language-text" data-lang="text">SELECT COUNT(DISTINCT salary) FROM cp.`employee.json`;
++---------+
+| EXPR$0 |
++---------+
+| 48 |
++---------+
+1 row selected (0.159 seconds)
+
+SELECT COUNT(ALL salary) FROM cp.`employee.json`;
++---------+
+| EXPR$0 |
++---------+
+| 1155 |
++---------+
+1 row selected (0.106 seconds)
+
+SELECT COUNT(salary) FROM cp.`employee.json`;
++---------+
+| EXPR$0 |
++---------+
+| 1155 |
++---------+
+1 row selected (0.102 seconds)
+
+SELECT COUNT(*) FROM cp.`employee.json`;
++---------+
+| EXPR$0 |
++---------+
+| 1155 |
++---------+
+1 row selected (0.174 seconds)
+</code></pre></div>
+<h2 id="min-and-max-functions">MIN and MAX Functions</h2>
+
+<p>These functions return the smallest and largest values of the selected columns, respectively.</p>
+
+<h3 id="min-and-max-syntax">MIN and MAX Syntax</h3>
+
+<p>MIN(column)<br>
+MAX(column)</p>
+
+<h3 id="min-and-max-examples">MIN and MAX Examples</h3>
+<div class="highlight"><pre><code class="language-text" data-lang="text">SELECT MIN(salary) FROM cp.`employee.json`;
++---------+
+| EXPR$0 |
++---------+
+| 20.0 |
++---------+
+1 row selected (0.138 seconds)
+
+SELECT MAX(salary) FROM cp.`employee.json`;
++----------+
+| EXPR$0 |
++----------+
+| 80000.0 |
++----------+
+1 row selected (0.139 seconds)
+</code></pre></div>
+<p>Use a correlated subquery to find the names and salaries of the lowest paid employees:</p>
+<div class="highlight"><pre><code class="language-text" data-lang="text">SELECT full_name, SALARY FROM cp.`employee.json` WHERE salary = (SELECT MIN(salary) FROM cp.`employee.json`);
++------------------------+---------+
+| full_name | SALARY |
++------------------------+---------+
+| Leopoldo Renfro | 20.0 |
+| Donna Brockett | 20.0 |
+| Laurie Anderson | 20.0 |
+. . .
+</code></pre></div>
+<h2 id="sum-function">SUM Function</h2>
+
+<p>Returns the total of a numeric column.</p>
+
+<h3 id="sum-syntax">SUM syntax</h3>
+
+<p><code>SUM(column)</code></p>
+
+<h3 id="examples">Examples</h3>
+<div class="highlight"><pre><code class="language-text" data-lang="text">SELECT SUM(ALL salary) FROM cp.`employee.json`;
++------------+
+| EXPR$0 |
++------------+
+| 4642640.0 |
++------------+
+1 row selected (0.123 seconds)
+
+SELECT SUM(DISTINCT salary) FROM cp.`employee.json`;
++-----------+
+| EXPR$0 |
++-----------+
+| 613120.0 |
++-----------+
+1 row selected (0.309 seconds)
+
+SELECT SUM(salary) FROM cp.`employee.json` WHERE employee_id IN (1139, 1140, 1141);
++----------+
+| EXPR$0 |
++----------+
+| 25300.0 |
++----------+
+1 row selected (1.995 seconds)
+</code></pre></div>
+<h2 id="aggregate-statistical-functions">Aggregate Statistical Functions</h2>
+
+<p>Drill provides following aggregate statistics functions:</p>
+
+<ul>
+<li>stddev(expression)<br>
+An alias for stddev_samp</li>
+<li>stddev_pop(expression)
+Population standard deviate of input values</li>
+<li>stddev_samp(expression)
+Sample standard deviate of input values</li>
+<li>variance(expression)
+An alias for var_samp</li>
+<li>var_pop(expression)
+Population variance of input values (the population standard deviated squared)</li>
+<li>var_samp(expression)
+Sample variance of input values (sample standard deviation squared)</li>
+</ul>
+
+<p>These functions take a SMALLINT, INTEGER, BIGINT, FLOAT, DOUBLE, or DECIMAL expression as the argument. If the expression is FLOAT, the function returns DOUBLE; otherwise, the function returns DECIMAL. As previously mentioned, DECIMAL is disabled. You can <a href="docs/supported-data-types/#enabling-the-decimal-type">enable the DECIMAL type</a>, but this is not recommended.</p>
+
+
+
+ <div class="doc-nav">
+
+ <span class="previous-toc"><a href="/drill/docs/string-manipulation/">← String Manipulation</a></span><span class="next-toc"><a href="/drill/docs/functions-for-handling-nulls/">Functions for Handling Nulls →</a></span>
+</div>
+
+
+ </div>
+ </div>
+</div>
+
+ </div>
+ <p class="push"></p>
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