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- <div class="int_text" align="left">
-
- <p>The USE command changes the schema context to the specified schema. When you
-issue the USE command to switch to a particular schema, Drill queries that
-schema only.</p>
-
-<h2 id="syntax">Syntax</h2>
-
-<p>The USE command supports the following syntax:</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">USE schema_name;
-</code></pre></div>
-<h2 id="parameters">Parameters</h2>
-
-<p><em>schema_name</em><br>
-A unique name for a Drill schema. A schema in Drill is a configured storage
-plugin, such as hive, or a storage plugin and workspace. For example,
-<code>dfs.donuts</code> where <code>dfs</code> is an instance of the file system configured as a
-storage plugin, and <code>donuts</code> is a workspace configured to point to a directory
-within the file system. You can configure and use multiple storage plugins and
-workspaces in Drill. See <a href="/docs/storage-plugin-registration">Storage Plugin Registration</a> and
-<a href="/docs/Workspaces">Workspaces</a>.</p>
-
-<h2 id="usage-notes">Usage Notes</h2>
-
-<p>Issue the USE command to change to a particular schema. When you use a schema,
-you do not have to include the full path to a file or table in your query. </p>
-
-<p>For example, to query a file named <code>donuts.json</code> in the
-<code>/users/max/drill/json/</code> directory, you must include the full file path in
-your query if you do not use a defined workspace</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">SELECT * FROM dfs.`/users/max/drill/json/donuts.json` WHERE type='frosted';
-</code></pre></div>
-<p>If you create a schema that points to the <code>~/json</code> directory where the file is
-located and then use the schema, you can issue the query without explicitly
-stating the file path:</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">USE dfs.json;
-SELECT * FROM `donuts.json`WHERE type='frosted';
-</code></pre></div>
-<p>If you do not use a schema before querying a table, you must use absolute
-notation, such as <code>[schema.]table[.column]</code>, to query the table. If you switch
-to the schema where the table exists, you can just specify the table name in
-the query. For example, to query a table named "<code>products</code>" in the <code>hive</code>
-schema, tell Drill to use the hive schema and then issue your query with the
-table name only:</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">USE hive;
-SELECT * FROM products limit 5;
-</code></pre></div>
-<p>Before you issue the USE command, you may want to run SHOW DATABASES or SHOW
-SCHEMAS to see a list of the configured storage plugins and workspaces.</p>
-
-<h2 id="example">Example</h2>
-
-<p>This example demonstrates how to use a file system and a hive schema to query
-a file and table in Drill. </p>
-
-<p>Issue the SHOW DATABASES or SHOW SCHEMAS command to see a list of the
-available schemas that you can use. Both commands return the same results.</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=drilldemo:5181> show schemas;
-+-------------+
-| SCHEMA_NAME |
-+-------------+
-| hive.default |
-| dfs.reviews |
-| dfs.flatten |
-| dfs.default |
-| dfs.root |
-| dfs.logs |
-| dfs.myviews |
-| dfs.clicks |
-| dfs.tmp |
-| sys |
-| hbase |
-| INFORMATION_SCHEMA |
-| s3.twitter |
-| s3.reviews |
-| s3.default |
-+-------------+
-15 rows selected (0.059 seconds)
-</code></pre></div>
-<p>Issue the USE command with the schema that you want Drill to query.<br>
-<strong>Note:</strong> If you use any of the Drill default schemas, such as <code>cp.default</code> or <code>dfs.default</code>, do not include .<code>default</code>. For example, if you want Drill to issue queries on files in its classpath, you can issue the following command:</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> use cp;
-+------------+------------+
-| ok | summary |
-+------------+------------+
-| true | Default schema changed to 'cp' |
-+------------+------------+
-1 row selected (0.04 seconds)
-</code></pre></div>
-<p>Issue the USE command with a file system schema.</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=drilldemo:5181> use dfs.logs;
-+------------+------------+
-| ok | summary |
-+------------+------------+
-| true | Default schema changed to 'dfs.logs' |
-+------------+------------+
-1 row selected (0.054 seconds)
-</code></pre></div>
-<p>You can issue the SHOW FILES command to view the files and directories within
-the schema.</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=drilldemo:5181> show files;
-+------------+-------------+------------+------------+------------+------------+-------------+------------+------------------+
-| name | isDirectory | isFile | length | owner | group | permissions | accessTime | modificationTime |
-+------------+-------------+------------+------------+------------+------------+-------------+------------+------------------+
-| csv | true | false | 1 | mapr | mapr | rwxrwxr-x | 2015-02-09 06:49:17.0 | 2015-02-09 06:50:11.172 |
-| logs | true | false | 3 | mapr | mapr | rwxrwxr-x | 2014-12-16 18:58:26.0 | 2014-12-16 18:58:27.223 |
-+------------+-------------+------------+------------+------------+------------+-------------+------------+------------------+
-2 rows selected (0.156 seconds)
-</code></pre></div>
-<p>Query a file or directory in the file system schema.</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=drilldemo:5181> select * from logs limit 5;
-+------------+------------+------------+------------+------------+------------+------------+------------+------------+------------+------------+------------+
-| dir0 | dir1 | trans_id | date | time | cust_id | device | state | camp_id | keywords | prod_id | purch_flag |
-+------------+------------+------------+------------+------------+------------+------------+------------+------------+------------+------------+------------+
-| 2014 | 8 | 24181 | 08/02/2014 | 09:23:52 | 0 | IOS5 | il | 2 | wait | 128 | false |
-| 2014 | 8 | 24195 | 08/02/2014 | 07:58:19 | 243 | IOS5 | mo | 6 | hmm | 107 | false |
-| 2014 | 8 | 24204 | 08/01/2014 | 12:10:27 | 12048 | IOS6 | il | 1 | marge | 324 | false |
-| 2014 | 8 | 24222 | 08/02/2014 | 16:28:37 | 2488 | IOS6 | pa | 2 | to | 391 | false |
-| 2014 | 8 | 24227 | 08/02/2014 | 07:14:00 | 154687 | IOS5 | wa | 2 | on | 376 | false |
-+------------+------------+------------+------------+------------+------------+------------+------------+------------+------------+------------+------------+
-</code></pre></div>
-<p>Issue the USE command to switch to the hive schema.</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=drilldemo:5181> use hive;
-+------------+------------+
-| ok | summary |
-+------------+------------+
-| true | Default schema changed to 'hive' |
-+------------+------------+
-1 row selected (0.093 seconds)
-</code></pre></div>
-<p>Issue the SHOW TABLES command to see the tables that exist within the schema.</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=drilldemo:5181> show tables;
-+--------------+------------+
-| TABLE_SCHEMA | TABLE_NAME |
-+--------------+------------+
-| hive.default | orders |
-| hive.default | products |
-+--------------+------------+
-2 rows selected (0.421 seconds)
-</code></pre></div>
-<p>Query a table within the schema.</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=drilldemo:5181> select * from products limit 5;
-+------------+------------+------------+------------+
-| prod_id | name | category | price |
-+------------+------------+------------+------------+
-| 0 | Sony notebook | laptop | 959 |
-| 1 | #10-4 1/8 x 9 1/2 Premium Diagonal Seam Envelopes | Envelopes | 16 |
-| 2 | #10- 4 1/8 x 9 1/2 Recycled Envelopes | Envelopes | 9 |
-| 3 | #10- 4 1/8 x 9 1/2 Security-Tint Envelopes | Envelopes | 8 |
-| 4 | #10 Self-Seal White Envelopes | Envelopes | 11 |
-+------------+------------+------------+------------+
-5 rows selected (0.211 seconds)
-</code></pre></div>
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