MDAC 2.5 SDK - OLE DB Programmer's Reference
Appendix C: OLE DB Properties

DBPROP_INDEX_NULLCOLLATION

Property group: Index

Property set: DBPROPSET_INDEX

Type: VT_I4

Typical R/W: R/W

Description: NULL Collation

Indicates how NULLs are collated in the index. One of the following:

• DBPROPVAL_NC_END—NULLs are collated at the end of the list, regardless of the collation order.
  
  
• DBPROPVAL_NC_START—NULLs are collated at the start of the list, regardless of the collation order.
  
  
• DBPROPVAL_NC_HIGH—NULLs are collated at the high end of the list.
  
  
• DBPROPVAL_NC_LOW—NULLs are collated at the low end of the list.