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Если ещё надо...
Code:
DBGridEh.FieldColumns[ColumnName].STFilter.ExpressionStr:='=Null';
DBGridEh.DefaultApplyFilter;
или
Code:
DBGridEh.FieldColumns[ColumnName].STFilter.ExpressionStr:='<>Null';
DBGridEh.DefaultApplyFilter;
Извини, что так поздно...
