sql语句巩固

查询每行随机值

if(object_id('tempdb..#cc','U')is not null)
drop table #cc
go
declare @a int
set @a=0
while @a<15
begin
if @a=0
select floor(rand()*3)+3 as cc into #cc
else
insert into #cc values( floor(rand()*3)+3 )
set @a=@a+1
end
select * from #cc

 

连接查询

select a.Class_Content,*from T1103.dbo.T101_1
inner join (SELECT Class_Code, Class_Content FROM   WssMng_SXZ.dbo.ClassTable
                    WHERE (Fk_ClassName = '案件来源')) as a on a.Class_Code = T101_1.M101_1_111
where unitID ='130800'

 

触发器 批量更新

declare @startid int
declare @j int
select @k = 5,@startid = 1

declare c_update_id cursor for
select ID from TABLE for update

open c_update_id

fetch next from c_update_id into @startid
while(@@fetch_status=0)
begin
 update TABLE set nid =  @j where ID= @startid
 fetch next from c_update_id into @startid
 select @j = @j + 1
end

CLOSE c_update_id
DEALLOCATE c_update_id

--批量更新

 

declare @id int
set @id = 0
update table set nid=@id,@id=@id+1

 

--查询表中约束字段名称

select b.name from sysobjects b join syscolumns a on b.id = a.cdefault

--删除存在的约束

exec('alter table TableName drop constraint ' + TABLE)

--给字段加注视

 

EXEC sp_addextendedproperty 'MS_Description', '描述', 'user', dbo, 'table', tablename, 'column', columnid

 

--随机数据

SELECT cast(floor(rand()*99999999) AS Bigint)

--newid

select abs(CHECKSUM(NEWID()))

select left(100000000 + CONVERT(bigint, ABS(CHECKSUM(NEWID()))), 8)