KEY_COLUMN_USAGE Rowset

OLE DB Programmer's Reference

GUID: DBSCHEMA_KEY_COLUMN_USAGE

Number of restriction columns: 7

Restriction columns: CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, CONSTRAINT_NAME, TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME

Default sort order: CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, CONSTRAINT_NAME, TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION

Description: The KEY_COLUMN_USAGE rowset identifies the columns defined in the catalog that are constrained as keys by a given user.

Column name	Type indicator	Description
CONSTRAINT_CATALOG	DBTYPE_WSTR	Catalog name. NULL if the provider does not support catalogs.
CONSTRAINT_SCHEMA	DBTYPE_WSTR	Unqualified schema name. NULL if the provider does not support schemas.
CONSTRAINT_NAME	DBTYPE_WSTR	Constraint name.
TABLE_CATALOG	DBTYPE_WSTR	Catalog name in which the table containing the key column is defined. NULL if the provider does not support catalogs.
TABLE_SCHEMA	DBTYPE_WSTR	Unqualified schema name in which the table containing the key column is defined. NULL if the provider does not support schemas.
TABLE_NAME	DBTYPE_WSTR	Table name containing the key column.
COLUMN_NAME	DBTYPE_WSTR	Name of the column participating in the unique, primary, or foreign key. This column, together with the COLUMN_GUID and COLUMN_PROPID columns, forms the column ID. One or more of these columns will be NULL, depending on which elements of the DBID structure the provider uses.
COLUMN_GUID	DBTYPE_GUID	Column GUID.
COLUMN_PROPID	DBTYPE_UI4	Column property ID.
ORDINAL_POSITION	DBTYPE_UI4	Ordinal position of the column in the constraint being described. If the constraint being described is a key of cardinality one, the value of ORDINAL_POSITION is always one.

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