用T-SQL语句用while循环语句编写2+4+6+8+10代码如下: declare @a int;set @a = 2;while @a <= 10begin print @a; set @a = @a + 2;end CREATE TRIGGER `书籍库存` AFTER INSERT ON `借阅表`FOR EACH ROWBEGIN UPDATE 书籍表 SET 库存量 = 库存量 - 1 WHERE...