Key_Column_Usage View

For every constraint (except NOT_NULL) and every index, the used columns and their ordinal positions within this order are listed.

Column	Data Type	N	Description
RECORD_NUMBER	integer	n	unique identifier for this record of metadata
CONSTRAINT_CATALOG	identifier	n	constraint catalog
CONSTRAINT_SCHEMA	identifier	n	constraint schema
CONSTRAINT_NAME	identifier	n	constraint name
TABLE_CATALOG	identifier	n	table catalog
TABLE_SCHEMA	identifier	n	table schema
TABLE_NAME	identifier	n	table name
COLUMN_NAME	identifier	n	column name
ORDINAL_POSTION	short	n	ordinal position of the column element inside the containing key
CONSTRAINT_TYPE	enumeration	n	contains zero or more of the following attributes: INDEX, PRIMARY, UNIQUE