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SQL ServerÖÐpivot and unpivotµÄÓ÷¨ £¨ÐÐÁл¥×ª£©

 .PivotµÄÓ÷¨Ìå»á:
Óï¾ä·¶Àý:
select PN,[2006/5/30] as [20060530],[2006/6/2] as [20060602]
from consumptiondata a
Pivot (sum(a.M_qty) FOR a.M_date in ([2006/5/30],[2006/6/2])) as PVT 
order by PN
 
Table½á¹¹ Consumptiondata (PN,M_Date,M_qty)
order by PN¿ÉÒª¿É²»Òª,²¢²»ÖØÒª,Ö»ÊÇÅÅÐòµÄ×÷ÓÃ
 
¹Ø¼üµÄÊǺìÉ«²¿·Ö,½âÎöÈçÏÂ,select ´ó¼Ò¶¼ÖªµÀ,PNÊÇ ConsumptionData±íÖеÄÒ»¸öColumn,
[2006/5/30]Ò²ÊÇÒ»¸öColumn,ËûÐèÒªÏÔʾ³É[20060530],×¢Òâ[2006/5/30]²»ÊÇÒ»¸öValue,¶øÊÇÒ»¸öColumn.[2006/6/2]Óë[2006/5/30]Ò»Ñù.
Pivot ( ........... ) as PVTÕâ¸ö½á¹¹Êǹ̶¨¸ñʽ,ûÓÐʲôÐèÒªÌØÊâ˵Ã÷µÄ,µ±È»PVTËæ±ãÄã¸øËûÒ»¸ö NICKNAME ,it doesn't make any differences.
sum(a.M_qty) ÊÇÎÒÃÇÏ£ÍûÏÔʾ³öÀ´µÄÖµ,×¢ÒâÕâ¸öµØ·½±ØÐëÓûã×ܺ¯Êý,·ñÔòÓï·¨²»»á¹ý.
FOR a.M_date in ([2006/5/30],[2006/6/2])for ±íʾ»ã×ܵÄÖµÒªÏÔʾÔÚÄÄÒ»¸öColumnÏÂÃæ
Èç¹ûÎÒÃÇÏëÈÃSum(M_qty)ÏÔʾÔÚPNת»»µÄColumnÏÂÃæ,Ôò¿ÉдΪFor PN, in µÄÇåµ¥±íʾÎÒÃǹØ×¢ÄÄЩҪ²é¿´µÄColumn,×¢ÒâÔÙ´ÎÇ¿µ÷ÊÇColumn,²»ÊÇValue. inµÄÇåµ¥ÊÇColumnÇåµ¥,²»ÊÇValueÇåµ¥,ÊÇM_dateµÄValueת»»³ÉµÄColumnÇåµ¥. 
 
2.UnPivot
--´Ë¶Î¿ÉÒÔÖ±½ÓÔÚSql 2005ÖÐÖ´ÐÐ
CREATE TABLE pvt (VendorID int, Emp1 int, Emp2 int,
Emp3 int, Emp4 int, Emp5 int)
GO
INSERT INTO pvt VALUES (1,4,3,5,4,4)
INSERT INTO pvt VALUES (2,4,1,5,5,5)
INSERT INTO pvt VALUES (3,4,3,5,4,4)
INSERT INTO pvt VALUES (4,4,2,5,5,4)
INSERT INTO pvt VALUES (5,5,1,5,5,5)
GO
--select * from PVT
--Unpivot the table.
SELECT VendorID, Employee, Orders
from PVT
UNPIVOT (
 Orders FOR Employee IN ([Emp1], [Emp2], [Emp3], [Emp4], [Emp5])
)AS unpvt
GO


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wait_type,waiting_tasks_count AS tasks,
wait_time_ms,max_wait_time_ms AS max_wait,
signal_wait_time_ms AS signal
from sys.dm_os_wait_stats
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declare @CausName as char(20) declare @causenameid as int declare
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declare @sign as char(20)
create table #tb ( Caus_Id int,CausName varchar(20),causNameid int,Caus_Description varchar(200),±êÖ¾ varchar(20))
 
DECLARE myCursor1 CURSOR F ......

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