--有輸入參數的存儲過程--create proc GetComment(@commentid int)asselect * from Comment where CommentID=@commentid --有輸入與輸出參數的存儲過程--create proc GetCommentCount@newsid int,@count int outputasselect @count=count(*) from Comment where NewsID=@newsid  --返回單個值的函數--create function MyFunction(@newsid int)returns intasbegindeclare @count intselect @count=count(*) from Comment where NewsID=@newsidreturn @countend --調用方法--declare @count intexec @count=MyFunction 2print @count --返回值為表的函數--Create function GetFunctionTable(@newsid int)returns tableasreturn(select * from Comment where NewsID=@newsid) --返回值為表的函數的調用--select * from GetFunctionTable(2)

--以前拼接的寫法　　set @sql=' select * from table where 1=1 '　　if (@addDate is not null)　　 set @sql = @sql+' and addDate = '+ @addDate + ' '　　if (@name <>'' and is not null)　　 set @sql = @sql+ ' and name = ' + @name + ' '　　exec(@sql)

　　--第一種寫法是 感覺代碼有些冗余　　if (@addDate is not null) and (@name <> '')　　 select * from table where addDate = @addDate and name = @name　　else if (@addDate is not null) and (@name ='')　　 select * from table where addDate = @addDate　　else if(@addDate is null) and (@name <> '')　　 select * from table where and name = @name　　else if(@addDate is null) and (@name = '')　　select * from table　　--第二種寫法是　　select * from table where (addDate = @addDate or @addDate is null) and (name = @name or @name = '')　　--第三種寫法是　　SELECT * FROM table where　　addDate = CASE @addDate IS NULL THEN addDate ELSE @addDate END,　　name = CASE @name WHEN '' THEN name ELSE @name END

--簡單賦值declare @a intset @a=5print @a --使用select語句賦值declare @user1 nvarchar(50)select @user1= '張三'print @user1declare @user2 nvarchar(50)select @user2 = Name from ST_User where ID=1print @user2 --使用update語句賦值declare @user3 nvarchar(50)update ST_User set @user3 = Name where ID=1print @user3 

--創建臨時表1create table #DU_User1(   [ID] [ int ]  NOT NULL ,   [Oid] [ int ] NOT NULL ,   [Login] [nvarchar](50) NOT NULL ,   [Rtx] [nvarchar](4) NOT NULL ,   [ Name ] [nvarchar](5) NOT NULL ,   [ Password ] [nvarchar]( max ) NULL ,   [State] [nvarchar](8) NOT NULL);--向臨時表1插入一條記錄insert into #DU_User1 (ID,Oid,[Login],Rtx, Name ,[ Password ],State) values (100,2, 'LS' , '0000' , '臨時' , '321' , '特殊' ); --從ST_User查詢數據，填充至新生成的臨時表select * into #DU_User2 from ST_User where ID<8 --查詢并聯合兩臨時表select * from #DU_User2 where ID<3 union select * from #DU_User1 --刪除兩臨時表drop table #DU_User1drop table #DU_User2 --創建臨時表CREATE TABLE #t(   [ID] [ int ] NOT NULL ,   [Oid] [ int ] NOT NULL ,   [Login] [nvarchar](50) NOT NULL ,   [Rtx] [nvarchar](4) NOT NULL ,   [ Name ] [nvarchar](5) NOT NULL ,   [ Password ] [nvarchar]( max ) NULL ,   [State] [nvarchar](8) NOT NULL ,) --將查詢結果集（多條數據）插入臨時表insert into #t select * from ST_User--不能這樣插入--select * into #t from dbo.ST_User --添加一列，為int型自增長子段alter table #t add [myid] int NOT NULL IDENTITY(1,1)--添加一列，默認填充全球唯一標識alter table #t add [myid1] uniqueidentifier NOT NULL default (newid()) select * from #tdrop table #t--給查詢結果集增加自增長列 --無主鍵時：select IDENTITY( int ,1,1) as ID, Name ,[Login],[ Password ] into #t from ST_Userselect * from #t --有主鍵時：select ( select SUM (1) from ST_User where ID<= a.ID) as myID,* from ST_User a order by myID--定義表變量declare @t table(   id int not null ,   msg nvarchar(50) null)insert into @t values (1, '1' )insert into @t values (2, '2' )select * from @t

--while循環計算1到100的和declare @a intdeclare @ sum intset @a=1set @ sum =0while @a<=100begin   set @ sum +=@a   set @a+=1endprint @ sum

--if,else條件分支if(1+1=2)begin   print '對'endelsebegin   print '錯'end --when then條件分支declare @today intdeclare @week nvarchar(3)set @today=3set @week= case   when @today=1 then '星期一'   when @today=2 then '星期二'   when @today=3 then '星期三'   when @today=4 then '星期四'   when @today=5 then '星期五'   when @today=6 then '星期六'   when @today=7 then '星期日'   else '值錯誤'endprint @week 

declare @ID intdeclare @Oid intdeclare @Login varchar (50) --定義一個游標declare user_cur cursor for select ID,Oid,[Login] from ST_User--打開游標open user_curwhile @@fetch_status=0begin--讀取游標   fetch next from user_cur into @ID,@Oid,@Login   print @ID   --print @Loginendclose user_cur--摧毀游標deallocate user_cur

declare @ID intdeclare @Oid intdeclare @Login varchar (50) --定義一個游標declare user_cur cursor for select ID,Oid,[Login] from ST_User--打開游標open user_curwhile @@fetch_status=0begin--讀取游標   fetch next from user_cur into @ID,@Oid,@Login   print @ID   --print @Loginendclose user_cur--摧毀游標deallocate user_cur

--創建觸發器Create trigger User_OnUpdate    On ST_User    for Update As    declare @msg nvarchar(50)   --@msg記錄修改情況   select @msg = N '姓名從“' + Deleted. Name + N '”修改為“' + Inserted. Name + '”' from Inserted,Deleted   --插入日志表   insert into [LOG](MSG) values (@msg)   --刪除觸發器drop trigger User_OnUpdate

--創建帶output參數的存儲過程CREATE PROCEDURE PR_Sum   @a int ,   @b int ,   @ sum int outputASBEGIN   set @ sum =@a+@bEND --創建Return返回值存儲過程CREATE PROCEDURE PR_Sum2   @a int ,   @b intASBEGIN   Return @a+@bEND   --執行存儲過程獲取output型返回值declare @mysum intexecute PR_Sum 1,2,@mysum outputprint @mysum --執行存儲過程獲取Return型返回值declare @mysum2 intexecute @mysum2= PR_Sum2 1,2print @mysum2

--新建標量值函數create function FUNC_Sum1(   @a int ,   @b int)returns intasbegin   return @a+@bend --新建內聯表值函數create function FUNC_UserTab_1(   @myId int)returns tableasreturn ( select * from ST_User where ID<@myId) --新建多語句表值函數create function FUNC_UserTab_2(   @myId int)returns @t table(   [ID] [ int ] NOT NULL ,   [Oid] [ int ] NOT NULL ,   [Login] [nvarchar](50) NOT NULL ,   [Rtx] [nvarchar](4) NOT NULL ,   [ Name ] [nvarchar](5) NOT NULL ,   [ Password ] [nvarchar]( max ) NULL ,   [State] [nvarchar](8) NOT NULL)asbegin   insert into @t select * from ST_User where ID<@myId   returnend --調用表值函數select * from dbo.FUNC_UserTab_1(15)--調用標量值函數declare @s intset @s=dbo.FUNC_Sum1(100,50)print @s --刪除標量值函數drop function FUNC_Sum1