01cc852982
### What changes were proposed in this pull request? Change the link to the Scala API document. ``` $ git grep "#org.apache.spark.package" docs/_layouts/global.html: <li><a href="api/scala/index.html#org.apache.spark.package">Scala</a></li> docs/index.md:* [Spark Scala API (Scaladoc)](api/scala/index.html#org.apache.spark.package) docs/rdd-programming-guide.md:[Scala](api/scala/#org.apache.spark.package), [Java](api/java/), [Python](api/python/) and [R](api/R/). ``` ### Why are the changes needed? The home page link for Scala API document is incorrect after upgrade to 3.0 ### Does this PR introduce any user-facing change? Document UI change only. ### How was this patch tested? Local test, attach screenshots below: Before: ![image](https://user-images.githubusercontent.com/4833765/74335713-c2385300-4dd7-11ea-95d8-f5a3639d2578.png) After: ![image](https://user-images.githubusercontent.com/4833765/74335727-cbc1bb00-4dd7-11ea-89d9-4dcc1310e679.png) Closes #27549 from xuanyuanking/scala-doc. Authored-by: Yuanjian Li <xyliyuanjian@gmail.com> Signed-off-by: Sean Owen <srowen@gmail.com>
108 lines
4 KiB
Markdown
108 lines
4 KiB
Markdown
---
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layout: global
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title: SHOW TABLES
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displayTitle: SHOW TABLES
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license: |
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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---
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### Description
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The `SHOW TABLES` statement returns all the tables for an optionally specified database.
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Additionally, the output of this statement may be filtered by an optional matching
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pattern. If no database is specified then the tables are returned from the
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current database.
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### Syntax
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{% highlight sql %}
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SHOW TABLES [ { FROM | IN } database_name ] [ LIKE 'regex_pattern' ]
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{% endhighlight %}
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### Parameters
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<dl>
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<dt><code><em>{ FROM | IN } database_name</em></code></dt>
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<dd>
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Specifies the database name from which tables are listed.
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</dd>
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<dt><code><em>LIKE regex_pattern</em></code></dt>
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<dd>
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Specifies the regular expression pattern that is used to filter out unwanted tables.
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<ul>
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<li> Except for `*` and `|` character, the pattern works like a regex.</li>
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<li> `*` alone matches 0 or more characters and `|` is used to separate multiple different regexes,
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any of which can match. </li>
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<li> The leading and trailing blanks are trimmed in the input pattern before processing.</li>
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</ul>
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</dd>
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</dl>
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### Example
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{% highlight sql %}
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-- List all tables in default database
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SHOW TABLES;
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+-----------+------------+--------------+--+
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| database | tableName | isTemporary |
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+-----------+------------+--------------+--+
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| default | sam | false |
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| default | sam1 | false |
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| default | suj | false |
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+-----------+------------+--------------+--+
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-- List all tables from userdb database
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SHOW TABLES FROM userdb;
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+-----------+------------+--------------+--+
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| database | tableName | isTemporary |
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+-----------+------------+--------------+--+
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| userdb | user1 | false |
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| userdb | user2 | false |
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+-----------+------------+--------------+--+
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-- List all tables in userdb database
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SHOW TABLES IN userdb;
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+-----------+------------+--------------+--+
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| database | tableName | isTemporary |
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+-----------+------------+--------------+--+
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| userdb | user1 | false |
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| userdb | user2 | false |
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+-----------+------------+--------------+--+
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-- List all tables from default database matching the pattern `sam*`
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SHOW TABLES FROM default LIKE 'sam*';
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+-----------+------------+--------------+--+
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| database | tableName | isTemporary |
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+-----------+------------+--------------+--+
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| default | sam | false |
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| default | sam1 | false |
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+-----------+------------+--------------+--+
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-- List all tables matching the pattern `sam*|suj`
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SHOW TABLES LIKE 'sam*|suj';
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+-----------+------------+--------------+--+
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| database | tableName | isTemporary |
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+-----------+------------+--------------+--+
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| default | sam | false |
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| default | sam1 | false |
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| default | suj | false |
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+-----------+------------+--------------+--+
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{% endhighlight %}
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### Related statements
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- [CREATE TABLE](sql-ref-syntax-ddl-create-table.html)
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- [DROP TABLE](sql-ref-syntax-ddl-drop-table.html)
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- [CREATE DATABASE](sql-ref-syntax-ddl-create-database.html)
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- [DROP DATABASE](sql-ref-syntax-ddl-drop-database.html)
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