MySQL 5.1 Reference Manual  /  INFORMATION_SCHEMA Tables  /  The INFORMATION_SCHEMA TABLE_CONSTRAINTS Table

20.21 The INFORMATION_SCHEMA TABLE_CONSTRAINTS Table

The TABLE_CONSTRAINTS table describes which tables have constraints.

INFORMATION_SCHEMA NameSHOW NameRemarks
CONSTRAINT_CATALOG NULL
CONSTRAINT_SCHEMA
CONSTRAINT_NAME
TABLE_SCHEMA
TABLE_NAME
CONSTRAINT_TYPE

Notes:

  • The CONSTRAINT_TYPE value can be UNIQUE, PRIMARY KEY, or FOREIGN KEY.

  • The UNIQUE and PRIMARY KEY information is about the same as what you get from the Key_name field in the output from SHOW INDEX when the Non_unique field is 0.

  • The CONSTRAINT_TYPE column can contain one of these values: UNIQUE, PRIMARY KEY, FOREIGN KEY, CHECK. This is a CHAR (not ENUM) column. The CHECK value is not available until we support CHECK.


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