75da05038b
### What changes were proposed in this pull request? Remove two leading spaces from sql tables. ### Why are the changes needed? Follow the format of other references such as https://docs.snowflake.com/en/sql-reference/constructs/join.html, https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_10002.htm, https://www.postgresql.org/docs/10/sql-select.html. ### Does this PR introduce any user-facing change? before ``` SELECT * FROM test; +-+ ... +-+ ``` after ``` SELECT * FROM test; +-+ ... +-+ ``` ### How was this patch tested? Manually build and check Closes #28348 from huaxingao/sql-format. Authored-by: Huaxin Gao <huaxing@us.ibm.com> Signed-off-by: gatorsmile <gatorsmile@gmail.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.
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.
- Except for
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 %}