VIEWS

The VIEWS table provides information about SQL views.

USE INFORMATION_SCHEMA; DESC VIEWS;

The output is as follows:

+----------------------+--------------+------+------+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------------------+--------------+------+------+---------+-------+ | TABLE_CATALOG | varchar(512) | NO | | NULL | | | TABLE_SCHEMA | varchar(64) | NO | | NULL | | | TABLE_NAME | varchar(64) | NO | | NULL | | | VIEW_DEFINITION | longtext | NO | | NULL | | | CHECK_OPTION | varchar(8) | NO | | NULL | | | IS_UPDATABLE | varchar(3) | NO | | NULL | | | DEFINER | varchar(77) | NO | | NULL | | | SECURITY_TYPE | varchar(7) | NO | | NULL | | | CHARACTER_SET_CLIENT | varchar(32) | NO | | NULL | | | COLLATION_CONNECTION | varchar(32) | NO | | NULL | | +----------------------+--------------+------+------+---------+-------+ 10 rows in set (0.00 sec)

Create a view and query the VIEWS table:

CREATE VIEW test.v1 AS SELECT 1; SELECT * FROM VIEWS\G

The output is as follows:

*************************** 1. row *************************** TABLE_CATALOG: def TABLE_SCHEMA: test TABLE_NAME: v1 VIEW_DEFINITION: SELECT 1 CHECK_OPTION: CASCADED IS_UPDATABLE: NO DEFINER: root@127.0.0.1 SECURITY_TYPE: DEFINER CHARACTER_SET_CLIENT: utf8mb4 COLLATION_CONNECTION: utf8mb4_0900_ai_ci 1 row in set (0.00 sec)

Fields in the VIEWS table are described as follows:

  • TABLE_CATALOG: The name of the catalog to which the view belongs. This value is always def.
  • TABLE_SCHEMA: The name of the schema to which the view belongs.
  • TABLE_NAME: The view name.
  • VIEW_DEFINITION: The definition of view, which is made by the SELECT statement when the view is created.
  • CHECK_OPTION: The CHECK_OPTION value. The value options are NONE, CASCADE, and LOCAL.
  • IS_UPDATABLE: Whether UPDATE/INSERT/DELETE is applicable to the view. In TiDB, the value is always NO.
  • DEFINER: The name of the user who creates the view, which is in the format of 'user_name'@'host_name'.
  • SECURITY_TYPE: The value of SQL SECURITY. The value options are DEFINER and INVOKER.
  • CHARACTER_SET_CLIENT: The value of the character_set_client session variable when the view is created.
  • COLLATION_CONNECTION: The value of the collation_connection session variable when the view is created.

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