### What changes were proposed in this pull request? Standardize sql reference ### Why are the changes needed? To have consistent docs ### Does this PR introduce any user-facing change? Yes ### How was this patch tested? Tested using jykyll build --serve Closes #26721 from huaxingao/spark-30085. Authored-by: Huaxin Gao <huaxing@us.ibm.com> Signed-off-by: Sean Owen <sean.owen@databricks.com>
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layout | title | displayTitle | license |
---|---|---|---|
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.
LIKE regex_pattern
-
Specifies the regular expression pattern that is used to filter out unwanted tables.
- Except for `*` and `|` character, the pattern works like a regex.
- `*` alone matches 0 or more characters and `|` is used to separate multiple different regexes, any of which can match.
- The leading and trailing blanks are trimmed in the input pattern before processing.
Example
{% 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 %}