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 VIEWS | SHOW VIEWS | 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 VIEWS statement returns all the views 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 views are returned from the
current database. If the specified database is global temporary view database, we will
list global temporary views. Note that the command also lists local temporary views
regardless of a given database.
Syntax
{% highlight sql %} SHOW VIEWS [ { FROM | IN } database_name ] [ LIKE regex_pattern ] {% endhighlight %}
Parameters
{ FROM | IN } database_name- Specifies the database name from which views are listed.
regex_pattern-
Specifies the regular expression pattern that is used to filter out unwanted views.
- 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 %} -- Create views in different databases, also create global/local temp views. CREATE VIEW sam AS SELECT id, salary FROM employee WHERE name = 'sam'; CREATE VIEW sam1 AS SELECT id, salary FROM employee WHERE name = 'sam1'; CREATE VIEW suj AS SELECT id, salary FROM employee WHERE name = 'suj'; USE userdb; CREATE VIEW user1 AS SELECT id, salary FROM default.employee WHERE name = 'user1'; CREATE VIEW user2 AS SELECT id, salary FROM default.employee WHERE name = 'user2'; USE default; CREATE GLOBAL TEMP VIEW temp1 AS SELECT 1 as col1; CREATE TEMP VIEW temp2 AS SELECT 1 as col1;
-- List all views in default database SHOW VIEWS; +-------------+------------+--------------+ | namespace | viewName | isTemporary | +-------------+------------+--------------+ | default | sam | false | | default | sam1 | false | | default | suj | false | | | temp2 | true | +-------------+------------+--------------+
-- List all views from userdb database SHOW VIEWS FROM userdb; +-------------+------------+--------------+ | namespace | viewName | isTemporary | +-------------+------------+--------------+ | userdb | user1 | false | | userdb | user2 | false | | | temp2 | true | +-------------+------------+--------------+
-- List all views in global temp view database SHOW VIEWS IN global_temp; +-------------+------------+--------------+ | namespace | viewName | isTemporary | +-------------+------------+--------------+ | global_temp | temp1 | true | | | temp2 | true | +-------------+------------+--------------+
-- List all views from default database matching the pattern sam*
SHOW VIEWS FROM default LIKE 'sam*';
+-----------+------------+--------------+
| namespace | viewName | isTemporary |
+-----------+------------+--------------+
| default | sam | false |
| default | sam1 | false |
+-----------+------------+--------------+
-- List all views from the current database matching the pattern sam|suj｜temp*
SHOW VIEWS LIKE 'sam|suj|temp*';
+-------------+------------+--------------+
| namespace | viewName | isTemporary |
+-------------+------------+--------------+
| default | sam | false |
| default | suj | false |
| | temp2 | true |
+-------------+------------+--------------+
{% endhighlight %}