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

DBPROP_CONCATNULLBEHAVIOR

Property group: Data Source Information

Property set: DBPROPSET_DATASOURCEINFO

Type: VT_I4

Typical R/W: R

Description: NULL Concatenation Behavior

Indicates how the data source object handles the concatenation of NULL-valued character data type columns with non–NULL-valued character data type columns. One of the following:

• DBPROPVAL_CB_NULL—The result is NULL valued.
  
  
• DBPROPVAL_CB_NON_NULL—The result is the concatenation of the non–NULL-valued column or columns.