日期:2014-05-18  浏览次数:20420 次

sql约束问题,求高手解答
学号为11位,如果不足11位或多于11位,则拒绝输入
Sno nchar(10)怎么用约束实现
create rule [dbo].[f1] as @aa like '[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]'

GO

------解决方案--------------------
SQL code
ALTER TABLE [ta]  WITH CHECK ADD  CONSTRAINT [CK_ta_1] CHECK  (([Sno] like '[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]'))
GO
ALTER TABLE [ta]  WITH CHECK ADD  CONSTRAINT [CK_ta] CHECK  ((len([Sno ])<=(11)))
GO