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DATETIME DTSTRART=DATETIME.NOW;
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×îºóÓÃTIMESPAN SP=DATETIME.NOW-DTSTART;

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SQL code:
CHECKPOINT
GO
DBCC FREEPROCCACHE
GO
DBCC DROPCLEANBUFFERS
GO
DBCC FREESYSTEMCACHE('ALL') ;
GO
SET Statistics IO ON
GO
SET Statistics TIME ON
GO
declare @b datetime,@e datetime
set @b =getdate()
select * from tbset @e =getdate()
select datediff(ms,@b,@e)
SET Statistics IO OFF
GO
SET Statistics TIME OFF
GO
DBCC DROPCLEANBUFFERS 從緩衝¼¯區ÖÐÒÆ³ýËùÓеÄÇå³ý緩衝區 DBCC FREEPROCCACHE


StopWatchÔÚÄǸöÃüÃû¿Õ¼äÏ£¬ºÃÏñûÕÒµ½

VB.NET code:

Dim sw As System.Diagnostics.Stopwatch = New Stopwatch()
sw.Start()


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select floor(months_between(date1,date2)) from A  
date1,date2·Ö±ðΪ±íÖеÄÁ½¸ö×Ö¶Î £¬¶¼ÎªÈÕÆÚÐÍ 
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SqlÅÅÐò - MS-SQL Server / »ù´¡Àà

ÎÒµÄTblworkbill±íµÄÊý¾ÝÈçÏÂ:
id workbillno ..................
1 1
2 6
3 a1
4 c2
5 2
6 aa
7 ......

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pl/SqlÈçºÎ²éѯ×Ö·û´®°üÀ¨%, 
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columnA
'222'
'33%44'
ÈçºÎ²éѯ±íaÖÐcolumnA×Ö¶ÎÖÐÄÄЩÐаüº¬'%'
лл
select * from a
where columna like '%/%%' escape '/'

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