KEY_COLUMN_USAGE (Transact-SQL)

 

THIS TOPIC APPLIES TO:yesSQL Server (starting with 2008)noAzure SQL DatabasenoAzure SQL Data Warehouse noParallel Data Warehouse

Returns one row for each column that is constrained as a key in the current database. This information schema view returns information about the objects to which the current user has permissions.

To retrieve information from these views, specify the fully qualified name of INFORMATION_SCHEMA.view_name.

Column nameData typeDescription
CONSTRAINT_CATALOGnvarchar(128)Constraint qualifier.
CONSTRAINT_SCHEMAnvarchar(128)Name of schema that contains the constraint.

 ** Important ** Do not use INFORMATION_SCHEMA views to determine the schema of an object. The only reliable way to find the schema of a object is to query the sys.objects catalog view.
CONSTRAINT_NAMEnvarchar(128)Constraint name.
TABLE_CATALOGnvarchar(128)Table qualifier.
TABLE_SCHEMAnvarchar(128)Name of schema that contains the table.

 ** Important ** Do not use INFORMATION_SCHEMA views to determine the schema of an object. The only reliable way to find the schema of a object is to query the sys.objects catalog view.
TABLE_NAMEnvarchar(128)Table name.
COLUMN_NAMEnvarchar(128)Column name.
ORDINAL_POSITIONintColumn ordinal position.

System Views (Transact-SQL)
Information Schema Views (Transact-SQL)
sys.columns (Transact-SQL)
sys.indexes (Transact-SQL)
sys.objects (Transact-SQL)
sys.foreign_keys (Transact-SQL)
sys.key_constraints (Transact-SQL)

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