需要简单基础的SQL语句答:INSERT INTO customers(cust_id,state,post_code)VALUE('Ariel',NULL,'94501');或 INSERT INTO customers(cust_id,state,post_code)VALUE('Ariel',,'94501');更新数据 UPDATE命令用于修改表中的数据。UPDATE order_rollup SET(qty,price)=(SELECT SUM(qty),SUM(price) FROM order_lines WHERE ...