我写的sql,如果读者信息表中状态不是正常,就不能在借阅表中添加记录 CREATE TRIGGER before_insert_jieyue
ON [dbo].[借阅信息表]
for INSERT,update
AS BEGIN
IF (select 状态
from dbo.读者信息表
where 读者编号=(select 读者编号 from inserted)) not in('正常')
PRINT '账号不正常'
ROLLBACK
END
请大神看看哪错了 ------最佳解决方案--------------------
CREATE TRIGGER before_insert_jieyue ON [dbo].[借阅信息表]
FOR INSERT, UPDATE
AS
BEGIN
IF EXISTS ( SELECT 1
FROM dbo.读者信息表
WHERE 读者编号 IN ( SELECT 读者编号
FROM inserted )
AND 状态 NOT IN ( '正常' ) )
PRINT '账号不正常'
ROLLBACK
END
------其他解决方案-------------------- CREATE TRIGGER before_insert_jieyue
ON [dbo].[借阅信息表]
for INSERT,update
AS BEGIN
IF exists(select 状态
from dbo.读者信息表
where 读者编号=(select 读者编号 from inserted)) not in('正常')
PRINT '账号不正常'
ROLLBACK
END
------其他解决方案-------------------- CREATE TRIGGER before_insert_jieyue
ON [dbo].[借阅信息表]
for INSERT,update
AS BEGIN
IF exists(select 状态
from dbo.读者信息表
where 读者编号=(select 读者编号 from inserted)) not in('正常') --红字的等号换成in会不会好点?inserted表里面一定是只有一条数据?
PRINT '账号不正常'
ROLLBACK
END ------其他解决方案--------------------