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>
118 lines
4.6 KiB
Markdown
118 lines
4.6 KiB
Markdown
---
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layout: global
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title: SHOW VIEWS
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displayTitle: SHOW VIEWS
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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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The `SHOW VIEWS` statement returns all the views for an optionally specified database.
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Additionally, the output of this statement may be filtered by an optional matching
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pattern. If no database is specified then the views are returned from the
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current database. If the specified database is global temporary view database, we will
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list global temporary views. Note that the command also lists local temporary views
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regardless of a given database.
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### Syntax
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```sql
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SHOW VIEWS [ { FROM | IN } database_name ] [ LIKE regex_pattern ]
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```
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### Parameters
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* **{ FROM `|` IN } database_name**
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Specifies the database name from which views are listed.
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* **regex_pattern**
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Specifies the regular expression pattern that is used to filter out unwanted views.
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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 views in different databases, also create global/local temp views.
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CREATE VIEW sam AS SELECT id, salary FROM employee WHERE name = 'sam';
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CREATE VIEW sam1 AS SELECT id, salary FROM employee WHERE name = 'sam1';
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CREATE VIEW suj AS SELECT id, salary FROM employee WHERE name = 'suj';
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USE userdb;
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CREATE VIEW user1 AS SELECT id, salary FROM default.employee WHERE name = 'user1';
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CREATE VIEW user2 AS SELECT id, salary FROM default.employee WHERE name = 'user2';
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USE default;
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CREATE GLOBAL TEMP VIEW temp1 AS SELECT 1 AS col1;
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CREATE TEMP VIEW temp2 AS SELECT 1 AS col1;
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-- List all views in default database
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SHOW VIEWS;
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+-------------+------------+--------------+
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| namespace | viewName | isTemporary |
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+-------------+------------+--------------+
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| default | sam | false |
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| default | sam1 | false |
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| default | suj | false |
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| | temp2 | true |
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+-------------+------------+--------------+
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-- List all views from userdb database
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SHOW VIEWS FROM userdb;
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+-------------+------------+--------------+
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| namespace | viewName | isTemporary |
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+-------------+------------+--------------+
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| userdb | user1 | false |
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| userdb | user2 | false |
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| | temp2 | true |
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+-------------+------------+--------------+
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-- List all views in global temp view database
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SHOW VIEWS IN global_temp;
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+-------------+------------+--------------+
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| namespace | viewName | isTemporary |
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+-------------+------------+--------------+
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| global_temp | temp1 | true |
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| | temp2 | true |
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+-------------+------------+--------------+
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-- List all views from default database matching the pattern `sam*`
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SHOW VIEWS FROM default LIKE 'sam*';
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+-----------+------------+--------------+
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| namespace | viewName | isTemporary |
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+-----------+------------+--------------+
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| default | sam | false |
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| default | sam1 | false |
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+-----------+------------+--------------+
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-- List all views from the current database matching the pattern `sam|suj｜temp*`
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SHOW VIEWS LIKE 'sam|suj|temp*';
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+-------------+------------+--------------+
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| namespace | viewName | isTemporary |
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+-------------+------------+--------------+
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| default | sam | false |
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| default | suj | false |
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| | temp2 | true |
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+-------------+------------+--------------+
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```
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### Related statements
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* [CREATE VIEW](sql-ref-syntax-ddl-create-view.html)
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* [DROP VIEW](sql-ref-syntax-ddl-drop-view.html)
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* [CREATE DATABASE](sql-ref-syntax-ddl-create-database.html)
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* [DROP DATABASE](sql-ref-syntax-ddl-drop-database.html)
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