`information_schema.key_column_usage.table_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: VARCHAR(512) NOT NULL

Note:

The name of the catalog to which the table belongs. The value is always def.

4-6.1

type: SQL_IDENTIFIER NULL

Note:

Name of the database that contains the table that contains the column that is restricted by this constraint (always the current database)

10-15

type: SQL_IDENTIFIER

Note:

Name of the database that contains the table that contains the column that is restricted by this constraint (always the current database)

8.2-9.6

Note:

Name of the database that contains the table that contains the column that is restricted by some constraint (always the current database)

7.4-8.1

type: unknown

Note:

Name of the database containing the constrained table.

2-21.2

Note:

Always equal to def (CockroachDB does not support the notion of catalogs).

1-1.1

type: NVARCHAR(128) NULL

Note:

Table qualifier.