MDAC 2.5 SDK - OLE DB Programmer's Reference
Appendix C: OLE DB Properties
Property group: Column
Property set: DBPROPSET_COLUMN
Type: VT_BOOL
Typical R/W: R/W
Description: Unique
Indicates whether values of the column must be unique within the table.
| Value | Meaning |
| VARIANT_TRUE | The values of the column must be unique within the table. |
| VARIANT_FALSE | The values of the column can be repeated within the table. |