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史上最全的MSSQL复习笔记(十)
e @classid int ---班级ID
set @classid=(select classid from grade where classname=@classname) --通过参数班级名称获取对应的班级ID
select * from Student where Sex=@sex and ClassId=@classid
set @cnt= (select COUNT(*) from Student where Sex=@sex and ClassId=@classid) --获取指定班级和性别的总人数
set @totalnum=(select COUNT(*) from Student) ----获取总人数
go
--调用存储过程,获取指定性别的学员人数及总人数
declare @num int,@tnum int
exec usp_getCountBySexandClassName @cnt=@num output ,@totalnum=@tnum output , @className='八期班'
print @num
print @tnum
print '做完了'
---获取指定班级的人数
if exists(select * from sysobjects where name='usp_getCount')
drop proc usp_getCount
go
create procedure usp_getCount
@className nvarchar(50)='八期班'
as
declare @classid int=(select classid from grade where classname=@className)
declare @cnt int
set @cnt =(select COUNT(*) from Student where ClassId=@classid)
--return 只能返回int整数值
--return '总人数是'+cast(@cnt as varchar(2))
return @cnt
go
--调用存储过程，接收存储过程的返回值
declare @count int
--set @count=(exec usp_getCount)
exec @count=usp_getCount '八期班'
print @count
if exists(select * from sysobjects where name='usp_getClassList')
drop proc usp_getClassList
go
create procedure usp_getClassList
as
select classid,classname from grade
go
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21.分页存储过程
if exists(select * from sysobjects where name='usp_getPageData') drop proc usp_getPageData go create procedure usp_getPageData @totalPage int output,--总页数 @pageIndex int =1 ,--当前页码，默认是第一页 @pageCount int =5 --每一页显示的记录数 as select * from (select ROW_NUMBER() over(order by studentno) id,* from Student) temp where temp.id>(@pageindex-1)*@pagecount and temp.id<=(@pageindex*@pagecount) set @totalPage=CEILING((select COUNT(*) from Student)*1.0/@pageCount) go
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22.索引
--创建局部临时表 create table #newGrade ( classid int , classname nvarchar(50) ) ---局部临时表只有在当前创建它的会话中使用，离开这个会话临时表就失效.如果关闭创建它的会话，那么临时表就会消失 insert into #newGrade select * from grade select * from #newGrade select * into #newnewnew from grade select * into newGrade from #newgrade --创建全局临时表:只要不关闭当前会话，全局临时表都可以使用，但是关闭当前会话，全局临时表也会消失 create table ##newGrade ( classid int , classname nvarchar(50) ) drop table ##newGrade select * into ##newGrade from grade select * from ##newGrade --创建表变量 declare @tb table(cid int,cname nvarchar(50)) insert into @tb select * from grade select * from @tb
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select * from sysindexes
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--create ?index IX_Student_studentName
--on 表名(字段名)
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--clustered index:聚集索引 ?nonclustered index--非聚集索引
if exists(select * from sysindexes where name='IX_Student_studentName')
?drop index student.IX_Student_studentName
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create clustered index IX_Student_studentName
on student(studentname)
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--如果是先创建主键再创建聚集索引就不可以，因为主键默认就是聚集索引
--但是如果先创建聚集索引，那么还可以再创建主键，因为主键不一定需要是聚集的
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23.临时表
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