MDAC 2.5 SDK - OLE DB Programmer's Reference
Appendix C: OLE DB Properties
Property group: Index
Property set: DBPROPSET_INDEX
Type: VT_BOOL
Typical R/W: R/W
Description: Unique
Indicates whether index keys must be unique.
| Value | Meaning |
| VARIANT_TRUE | The index keys must be unique. |
| VARIANT_FALSE | Duplicate keys are allowed. |