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create function [dbo].[DeptTree](@initDeptCode  varchar(10))/*¶¨Ò庯Êýc_tree£¬ÊäÈë²ÎÊýΪ³õʼ½ÚµãDeptCode*/
returns @t table(DeptCode varchar(10),UpDeptCode  varchar(10),lev int)/*¶¨Òå±ítÓÃÀ´´æ·ÅÈ¡³öµÄÊý¾Ý*/
begin
  declare @i int/*±êÖ¾µÝ¹é¼¶±ð*/
  set @i=1
  insert @t select DeptCode,UpDeptCode,@i from vi_dept where DeptCode=@initDeptCode
  while @@rowcount<>0
  begin
  set @i=@i+1
  insert @t select a.DeptCode,a.UpDeptCode,@i from vi_dept as a,@t as b
 where b.DeptCode=a.UpDeptCode and b.lev=@i-1
  end
return
end
 select * from dbo.DeptTree('0000')


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use pubs
go
select avg(distinct price)  --ËãÆ½¾ùÊý
from titles
where type='business'
go 
use pubs
go
select max(ytd_sales)  --×î´óÊý
from titles
go 
use pubs
go
select min(ytd_sales) --×îÐ¡Ê ......

SQL²åÈëÀýÌâ

--´´½¨±íTongXunLu
CREATE TABLE TongXunLu
 (
 [tName] nvarchar(30),
 [tAddress] nvarchar(50),
 [tEmail] varchar(50)
 )
--´´½¨±í students
CREATE TABLE students
 (
 [sId] int IDENTITY (1, 1) primary key NOT NULL ,
 [sName] varchar (50)   NOT ......

SQLÓï¾ä£ºGroup By Óï¾äС½á

1. Group By Óï¾ä¼ò½é£º
Group ByÓï¾ä´ÓÓ¢ÎĵÄ×ÖÃæÒâÒåÉÏÀí½â¾ÍÊÇ“¸ù¾Ý(by)Ò»¶¨µÄ¹æÔò½øÐзÖ×é(Group)”¡£ËüµÄ×÷ÓÃÊÇͨ¹ýÒ»¶¨µÄ¹æÔò½«Ò»¸öÊý¾Ý¼¯»®·Ö³ÉÈô¸É¸öСµÄÇøÓò£¬È»ºóÕë¶ÔÈô¸É¸öÐ¡ÇøÓò½øÐÐÊý¾Ý´¦Àí¡£
P.S. ÕâÀïÕæÊÇÌå»áµ½ÁËÒ»¸öºÃµÄÃüÃûµÄÁ¦Á¿£¬Group By´Ó×ÖÃæÊÇÖ±½ÓÈ¥Àí½âÊǷdz£ºÃÀí½âµÄ¡£¶÷£¬ÒÔºóÔÚÃü ......

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ÀýÈçÏÂÃæÕâ¾ä£º  string readstring = "select * from ʵÀý where ʵÀýID='"+eid+"'";
È»ºóÖ´ÐÐ Myconnection();
        DataSet ds = new DataSet();
        OleD ......
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