a75dc80a76
### 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>
89 lines
2.6 KiB
Markdown
89 lines
2.6 KiB
Markdown
---
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layout: global
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title: SHOW DATABASES
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displayTitle: SHOW DATABASES
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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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Lists the databases that match an optionally supplied regular expression pattern. If no
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pattern is supplied then the command lists all the databases in the system.
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Please note that the usage of `SCHEMAS` and `DATABASES` are interchangeable
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and mean the same thing.
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### Syntax
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```sql
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SHOW { DATABASES | SCHEMAS } [ LIKE regex_pattern ]
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```
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### Parameters
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* **regex_pattern**
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Specifies a regular expression pattern that is used to filter the results of the
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statement.
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* Except for `*` and `|` character, the pattern works like a regular expression.
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* `*` alone matches 0 or more characters and `|` is used to separate multiple different regular expressions,
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any of which can match.
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* The leading and trailing blanks are trimmed in the input pattern before processing. The pattern match is case-insensitive.
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### Examples
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```sql
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-- Create database. Assumes a database named `default` already exists in
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-- the system.
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CREATE DATABASE payroll_db;
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CREATE DATABASE payments_db;
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-- Lists all the databases.
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SHOW DATABASES;
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+------------+
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|databaseName|
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+------------+
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| default|
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| payments_db|
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| payroll_db|
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+------------+
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-- Lists databases with name starting with string pattern `pay`
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SHOW DATABASES LIKE 'pay*';
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+------------+
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|databaseName|
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+------------+
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| payments_db|
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| payroll_db|
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+------------+
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-- Lists all databases. Keywords SCHEMAS and DATABASES are interchangeable.
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SHOW SCHEMAS;
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+------------+
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|databaseName|
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+------------+
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| default|
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| payments_db|
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| payroll_db|
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+------------+
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```
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### Related Statements
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* [DESCRIBE DATABASE](sql-ref-syntax-aux-describe-database.html)
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* [CREATE DATABASE](sql-ref-syntax-ddl-create-database.html)
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* [ALTER DATABASE](sql-ref-syntax-ddl-alter-database.html)
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