select SaleOrderNO,Man,ManDate FROM StorageMT where (SaleOrderNO like '@SaleOrderNO%' OR SaleOrderNO IS NULL ) AND (Man like '@Man %' OR Man IS NULL) AND (ManDate like '@ManDate%' OR ManDate IS NULL) ORDER BY SaleOrderNO DESC
isnull( SaleOrderNO,'') like '%'
加条件判断if else