layout: global title: SHOW DATABASES displayTitle: SHOW DATABASES license: | 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

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Description

Lists the databases that match an optionally supplied regular expression pattern. If no pattern is supplied then the command lists all the databases in the system. Please note that the usage of SCHEMAS and DATABASES are interchangeable and mean the same thing.

Syntax

SHOW { DATABASES | SCHEMAS } [ LIKE regex_pattern ]

Parameters

  • regex_pattern

    Specifies a regular expression pattern that is used to filter the results of the statement.

    • 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

-- Create database. Assumes a database named `default` already exists in
-- the system. 
CREATE DATABASE payroll_db;
CREATE DATABASE payments_db;

-- Lists all the databases. 
SHOW DATABASES;
+------------+
|databaseName|
+------------+
|     default|
| payments_db|
|  payroll_db|
+------------+
  
-- Lists databases with name starting with string pattern `pay`
SHOW DATABASES LIKE 'pay*';
+------------+
|databaseName|
+------------+
| payments_db|
|  payroll_db|
+------------+
  
-- Lists all databases. Keywords SCHEMAS and DATABASES are interchangeable. 
SHOW SCHEMAS;
+------------+
|databaseName|
+------------+
|     default|
| payments_db|
|  payroll_db|
+------------+

Related Statements