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### What changes were proposed in this pull request? Remove the unneeded embedded inline HTML markup by using the basic markdown syntax. Please see #28414 ### Why are the changes needed? Make the doc cleaner and easily editable by MD editors. ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? Manually build and check Closes #28451 from huaxingao/html_cleanup. Authored-by: Huaxin Gao <huaxing@us.ibm.com> Signed-off-by: Sean Owen <srowen@gmail.com>
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layout | title | displayTitle | license |
---|---|---|---|
global | SHOW DATABASES | SHOW DATABASES | 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
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.
- Except for
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|
+------------+