Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

ÇóÒ»SQL - .NET¼¼Êõ / C#

ÏÖÓÐÁ½¸ö±í

  ±í1 user (Óû§ÐÅÏ¢ )  

  username password  
  A 123  
  B 000
  C 555




±í2 record (Óû§¼Ç¼)
  id username logintime
  1 C 2009-10-10
  2 A 2009-10-11
  3 A 2009-10-12
  4 B 2009-10-13
  5 B 2009-10-15
  6 C 2009-10-16


±í2 idÁÐÊÇ×Ô¶¯±àºÅ£¬recordtimeÊÇ×îºóµÇ½ʱ¼äʱ¼ä£¬ÏÖÔÚÒªÏÔʾ±í1µÄËùÓÐÐÅÏ¢ ¼°×îºó¼Ç¼ʱ¼ä,½á¹ûÓ¦¸ÃÈçÏÂ

username password logintime
A 123 2009-10-12
B 000 2009-10-15
C 555 2009-10-16

ÇëÎÊÕâÌõSQLÓï¾äÈçºÎд



   



ÎÒ»¹ÔÚѧ£¬µÈÎÒѧ»áÁ˽ÌÄã°¡£¬¸Â¸Â...

select username,password,(select top 1 logintime from record where record.username=[user].username order by logintime desc ) from [user] 


select a.*,b.lasttime from user as a 
left join
(select max(logintime)as lasttime,username from record group by username)
as b
on a.username = b.username

select t1.*,t2.lasttime from user t1 
left join
(select username,max(logintime)as lasttime from record g


Ïà¹ØÎÊ´ð£º

jspÁ´½Ósql2000µÄÒÉÎÊ£¿



type Exception report


message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jas ......

C# DataSetµ¼³öxml Åú´¦Àí(Ñ­»·)µÃÔõô´¦Àí

DataSetµ¼³öxml Åú´¦Àí(Ñ­»·)µÃÔõô´¦Àí
XMLÎļþ
<A>
      <B>
        <C>
        </C>
  &nb ......

Çë½ÌsqlÓï¾ä¡£ - Oracle / ¿ª·¢

ÎÒÓÐÒ»¸ö±í£¬½á¹¹ÊÇÕâÑù¡£
  ת³ö µ¥Î» תÈ뵥λ ±ÊÊý ½ð¶î
date(Ö÷) outid(Ö÷) inid(Ö÷) num amt
2009 1 2 1 500 Ϊ 1 µ¥Î» ÔÚ2009Ä ......

Êý¾ÝÒÔxml¸ñʽ·µ»Ø - MS-SQL Server / Ó¦ÓÃʵÀý

´ÓÊý¾Ý¿âÖвéѯһÕűíµÄÊý¾Ý
select ²¿ÃÅ,ÐÕÃû from tb
ÈçºÎ²ÅÄÜÉú³ÉÏÂÃæµÄxml¸ñʽ
XML code:
<folder state="unchecked" label="È«²¿">
¡¡¡¡ <folder state="unchecked&qu ......

ÇóÒ»¸öSQLÓï¾ä - MS-SQL Server / »ù´¡Àà

×Ö¶Î1,×Ö¶Î2.....×Ö¶ÎN,Status,ParentID
1,Name1....test1,1,99
1,Name1....test1,3,99
1,Name2....test2,1,101
1,Name2....test2,3,101
1,Name3....test3,2,101
1,Name1....test1,4,101
ÏëÒªµÄ½á¹ûÊÇ:
1,Na ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ