spark-instrumented-optimizer/docs/sql-ref-syntax-aux-show-tables.md

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global	SHOW TABLES	SHOW TABLES	Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Description

The SHOW TABLES statement returns all the tables for an optionally specified database. Additionally, the output of this statement may be filtered by an optional matching pattern. If no database is specified then the tables are returned from the current database.

Syntax

{% highlight sql %} SHOW TABLES [ { FROM | IN } database_name ] [ LIKE regex_pattern ] {% endhighlight %}

Parameters

{ FROM | IN } database_name

Specifies the database name from which tables are listed.

regex_pattern

Specifies the regular expression pattern that is used to filter out unwanted tables.

• Except for * and | character, the pattern works like a regular expression.
• * alone matches 0 or more characters and | is used to separate multiple different regular expressions, any of which can match.
• The leading and trailing blanks are trimmed in the input pattern before processing. The pattern match is case-insensitive.

Examples

{% highlight sql %} -- List all tables in default database SHOW TABLES; +--------+---------+-----------+ |database|tableName|isTemporary| +--------+---------+-----------+ | default| sam| false| | default| sam1| false| | default| suj| false| +--------+---------+-----------+

-- List all tables from userdb database SHOW TABLES FROM userdb; +--------+---------+-----------+ |database|tableName|isTemporary| +--------+---------+-----------+ | userdb| user1| false| | userdb| user2| false| +--------+---------+-----------+

-- List all tables in userdb database SHOW TABLES IN userdb; +--------+---------+-----------+ |database|tableName|isTemporary| +--------+---------+-----------+ | userdb| user1| false| | userdb| user2| false| +--------+---------+-----------+

-- List all tables from default database matching the pattern sam* SHOW TABLES FROM default LIKE 'sam*'; +--------+---------+-----------+ |database|tableName|isTemporary| +--------+---------+-----------+ | default| sam| false| | default| sam1| false| +--------+---------+-----------+

-- List all tables matching the pattern sam*|suj SHOW TABLES LIKE 'sam*|suj'; +--------+---------+-----------+ |database|tableName|isTemporary| +--------+---------+-----------+ | default| sam| false| | default| sam1| false| | default| suj| false| +--------+---------+-----------+ {% endhighlight %}

Related Statements

• CREATE TABLE
• DROP TABLE
• CREATE DATABASE
• DROP DATABASE