`information_schema.referential_constraints.unique_constraint_catalog`

mysql

type: VARCHAR NOT NULL

5.7-8

type: NULL

Note:

Always def.

5.1-10.8

type: VARCHAR NOT NULL

Note:

Always def.

type: SQL_IDENTIFIER NULL

Note:

Name of the database that contains the unique or primary key constraint that the foreign key constraint references (always the current database)

10-15

type: SQL_IDENTIFIER

Note:

Name of the database that contains the unique or primary key constraint that the foreign key constraint references (always the current database)

7.4-9.6

type: unknown

Note:

Name of the database containing the UNIQUE or PRIMARY KEY constraint that the foreign key constraint references (always the current database).

2.1-21.2

Note:

Name of the database containing the unique or primary key constraint that the foreign key constraint references (always the current database).

type: NVARCHAR(128) NULL

Note:

UNIQUE constraint qualifier.