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http://topic.csdn.net/u/20091008/12/a2577eba-1b5b-4e1e-ab20-0a047bf3f8d7.html?4385
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SQL code:
update a set
ʱ¼ä = b.ʱ¼ä
from tb1 as a
join tb2 as b
on a.¿¨ºÅ= b.¿¨ºÅ
where not exists(select * from tb2
where ¿¨ºÅ=b.¿¨ºÅ and ʱ¼ä> b.ʱ¼ä)

3 ......

sql Óï¾ä

±íA
¿¨ºÅ         ʱ¼ä
1                 null
2                 null
3                 null
±íB
¿¨ºÅ     &n ......

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3. ÔÚÄÄÓÐÏÂÔØ£¬×îºÃÊÇÃâϵÁкţ¬¼´D°æ¡£

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ÄÜÓÃ

ÓÐһЩ²»¿ÉÒÔÓà Ó ......

sql²éѯÎÊÌâ

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sql²éѯÎÊÌâ

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FULL JOIN

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SELECT ISNULL(A.feename,B.feename)feename,ISNULL(A.money,0)-ISNULL( ......

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month
1
2
3
4
5
6
7
8
9
10
11
12
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SQL code:

select top 12 month=identity(int,1,1) into #t from sysobjects
select * from #t


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