Contains one row for each column, owned by the current user in the current database, that is constrained as a key. The INFORMATION_SCHEMA.KEY_COLUMN_USAGE view is based on the sysobjects, syscolumns, sysreferences, spt_values, and sysindexes system tables.
To retrieve information from these views, specify the fully qualified name of INFORMATION_SCHEMA view_name.
| Column name | Data type | Description |
|---|---|---|
| CONSTRAINT_CATALOG | nvarchar(128) | Constraint qualifier |
| CONSTRAINT_SCHEMA | nvarchar(128) | Constraint owner name |
| CONSTRAINT_NAME | nvarchar(128) | Constraint name |
| TABLE_CATALOG | nvarchar(128) | Table qualifier |
| TABLE_SCHEMA | nvarchar(128) | Table owner name |
| TABLE_NAME | nvarchar(128) | Table name |
| COLUMN_NAME | nvarchar(128) | Column name |
| ORIGINAL_POSTION | smallint | Column ordinal position |
| syscolumns | sysobjects |
| sysindexes | sysreferences |