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- <h1>CREATE VIEW Command</h1>
-
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-
- <div class="int_text" align="left">
-
- <p>The CREATE VIEW command creates a virtual structure for the result set of a
-stored query. A view can combine data from multiple underlying data sources
-and provide the illusion that all of the data is from one source. You can use
-views to protect sensitive data, for data aggregation, and to hide data
-complexity from users. You can create Drill views from files in your local and
-distributed file systems, Hive, HBase, and MapR-DB tables, as well as from
-existing views or any other available storage plugin data sources.</p>
-
-<h2 id="syntax">Syntax</h2>
-
-<p>The CREATE VIEW command supports the following syntax:</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">CREATE [OR REPLACE] VIEW [workspace.]view_name [ (column_name [, ...]) ] AS <query>;
-</code></pre></div>
-<p>Use CREATE VIEW to create a new view. Use CREATE OR REPLACE VIEW to replace an
-existing view with the same name. When you replace a view, the query must
-generate the same set of columns with the same column names and data types.</p>
-
-<p><strong>Note:</strong> Follow Drill\u2019s rules for identifiers when you name the view. See coming soon...</p>
-
-<h2 id="parameters">Parameters</h2>
-
-<p><em>workspace</em><br>
-The location where you want the view to exist. By default, the view is created
-in the current workspace. See
-<a href="/docs/Workspaces">Workspaces</a>.</p>
-
-<p><em>view_name</em><br>
-The name that you give the view. The view must have a unique name. It cannot
-have the same name as any other view or table in the workspace.</p>
-
-<p><em>column_name</em><br>
-Optional list of column names in the view. If you do not supply column names,
-they are derived from the query.</p>
-
-<p><em>query</em><br>
-A SELECT statement that defines the columns and rows in the view.</p>
-
-<h2 id="usage-notes">Usage Notes</h2>
-
-<h3 id="storage">Storage</h3>
-
-<p>Drill stores views in the location specified by the workspace that you use
-when you run the CREATE VIEW command. If the workspace is not defined, Drill
-creates the view in the current workspace. You must use a writable workspace
-when you create a view. Currently, Drill only supports views created in the
-file system or distributed file system.</p>
-
-<p>The following example shows a writable workspace as defined within the storage
-plugin in the <code>/tmp</code> directory of the file system:</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">"tmp": {
- "location": "/tmp",
- "writable": true,
- }
-</code></pre></div>
-<p>Drill stores the view definition in JSON format with the name that you specify
-when you run the CREATE VIEW command, suffixed <code>by .view.drill</code>. For example,
-if you create a view named <code>myview</code>, Drill stores the view in the designated
-workspace as <code>myview.view.drill</code>.</p>
-
-<p>Data Sources</p>
-
-<p>Drill considers data sources to have either a strong schema or a weak schema. </p>
-
-<h5 id="strong-schema">Strong Schema</h5>
-
-<p>With the exception of text file data sources, Drill verifies that data sources
-associated with a strong schema contain data types compatible with those used
-in the query. Drill also verifies that the columns referenced in the query
-exist in the underlying data sources. If the columns do not exist, CREATE VIEW
-fails.</p>
-
-<h4 id="weak-schema">Weak Schema</h4>
-
-<p>Drill does not verify that data sources associated with a weak schema contain
-data types compatible with those used in the query. Drill does not verify if
-columns referenced in a query on a Parquet data source exist, therefore CREATE
-VIEW always succeeds. In the case of JSON files, Drill does not verify if the
-files contain the maps specified in the view.</p>
-
-<p>The following table lists the current categories of schema and the data
-sources associated with each:</p>
-
-<table>
- <tr>
- <th></th>
- <th>Strong Schema</th>
- <th>Weak Schema</th>
- </tr>
- <tr>
- <td valign="top">Data Sources</td>
- <td>views<br>hive tables<br>hbase column families<br>text</td>
- <td>json<br>mongodb<br>hbase column qualifiers<br>parquet</td>
- </tr>
-</table>
-
-
-<h2 id="related-commands">Related Commands</h2>
-
-<p>After you create a view using the CREATE VIEW command, you can issue the
-following commands against the view:</p>
-
-<ul>
-<li>SELECT </li>
-<li>DESCRIBE </li>
-<li>DROP </li>
-</ul>
-
-<div class="admonition note">
- <p class="first admonition-title">Note</p>
- <p class="last">You cannot update, insert into, or delete from a view. </p>
-</div>
-
-<h2 id="example">Example</h2>
-
-<p>This example shows you some steps that you can follow when you want to create
-a view in Drill using the CREATE VIEW command. A workspace named \u201cdonuts\u201d was
-created for the steps in this example.</p>
-
-<p>Complete the following steps to create a view in Drill:</p>
-
-<ol>
-<li><p>Decide which workspace you will use to create the view, and verify that the writable option is set to \u201ctrue.\u201d You can use an existing workspace, or you can create a new workspace. See <a href="https://cwiki.apache.org/confluence/display/DRILL/Workspaces">Workspaces</a> for more information. </p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">"workspaces": {
- "donuts": {
- "location": "/home/donuts",
- "writable": true,
- "defaultInputFormat": null
- }
- },
-</code></pre></div></li>
-<li><p>Run SHOW DATABASES to verify that Drill recognizes the workspace. </p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> show databases;
-+-------------+
-| SCHEMA_NAME |
-+-------------+
-| dfs.default |
-| dfs.root |
-| dfs.donuts |
-| dfs.tmp |
-| cp.default |
-| sys |
-| INFORMATION_SCHEMA |
-+-------------+
-</code></pre></div></li>
-<li><p>Use the writable workspace. </p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> use dfs.donuts;
-+------------+------------+
-| ok | summary |
-+------------+------------+
-| true | Default schema changed to 'dfs.donuts' |
-+------------+------------+
-</code></pre></div></li>
-<li><p>Test run the query that you plan to use with the CREATE VIEW command. </p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> select id, type, name, ppu from `donuts.json`;
-+------------+------------+------------+------------+
-| id | type | name | ppu |
-+------------+------------+------------+------------+
-| 0001 | donut | Cake | 0.55 |
-+------------+------------+------------+------------+
-</code></pre></div></li>
-<li><p>Run the CREATE VIEW command with the query. </p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> create view mydonuts as select id, type, name, ppu from `donuts.json`;
-+------------+------------+
-| ok | summary |
-+------------+------------+
-| true | View 'mydonuts' created successfully in 'dfs.donuts' schema |
-+------------+------------+
-</code></pre></div></li>
-<li><p>Create a new view in another workspace from the current workspace. </p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> create view dfs.tmp.yourdonuts as select id, type, name from `donuts.json`;
-+------------+------------+
-| ok | summary |
-+------------+------------+
-| true | View 'yourdonuts' created successfully in 'dfs.tmp' schema |
-+------------+------------+
-</code></pre></div></li>
-<li><p>Query the view created in both workspaces.</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> select * from mydonuts;
-+------------+------------+------------+------------+
-| id | type | name | ppu |
-+------------+------------+------------+------------+
-| 0001 | donut | Cake | 0.55 |
-+------------+------------+------------+------------+
-
-0: jdbc:drill:zk=local> select * from dfs.tmp.yourdonuts;
-+------------+------------+------------+
-| id | type | name |
-+------------+------------+------------+
-| 0001 | donut | Cake |
-+------------+------------+------------+
-</code></pre></div></li>
-</ol>
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