The Column Definition property returns valid clauses that can be used in column definition.
object.Properties("Column Definition")
object
Expression that evaluates to an object in the Applies To list.
adInteger
Read-only
DBPROP_COLUMNDEFINITION
Column Definition returns a bitmask defining the valid clauses for the definition of a column. For example, if Column Definition returns DBPROPVAL_CD_NOTNULL, the NOT NULL clause is supported.