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CONSTRAINT_COLUMN_USAGE (Transact-SQL)

Returns one row for each column in the current database that has a constraint defined on the column. 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 name

Data type

Description

TABLE_CATALOG

nvarchar( 128)

Table qualifier.

TABLE_SCHEMA

nvarchar( 128)

Name of schema that contains the table owner.

Important note 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_NAME

nvarchar( 128)

Table name.

COLUMN_NAME

nvarchar( 128)

Column name.

CONSTRAINT_CATALOG

nvarchar( 128)

Constraint qualifier.

CONSTRAINT_SCHEMA

nvarchar( 128)

Name of schema that contains the constraint.

Important note 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_NAME

nvarchar( 128)

Constraint name.

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