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

Çë½ÌÒ»ÌõSQLÓï¾ä

±í tableA
no  type
1    A
2    A
4    A
5    A
2    B
3    B

ÓÃÒ»ÌõSQLÓï¾äµÃ³ö,no×Ö¶ÎÖÐÒÔtype·Ö×é×î´óµÄÊý×Ö,ÈçÖмäÓжϺÅÔòÈ¡¶ÏºÅ
no  type
3    A
4    B

A·Ö×éÖÐ×î´óµÄÊÇ5,B·Ö×éÖÐ×îµÄµÄÊÇ3°¡.
no  type
3    A
4    B
ÕâÊÇÄãÌṩµÄÔ¤ÆÚ½á¹ûÂð?
Ôõô¸Ð¾õÎÒ²»ÔÚµØÇò?
¶ÏºÅ?ÔõôÀí½â?

ÒýÓÃ
A·Ö×éÖÐ×î´óµÄÊÇ5,B·Ö×éÖÐ×îµÄµÄÊÇ3°¡.
no  type
3    A
4    B
ÕâÊÇÄãÌṩµÄÔ¤ÆÚ½á¹ûÂð?
Ôõô¸Ð¾õÎÒ²»ÔÚµØÇò?
¶ÏºÅ?ÔõôÀí½â?

Â¥Ö÷µÄ½á¹û¹ûÈ»²»ÊÇÒ»°ãÈËÄܹ»Àí½â

ÄãÕâÎÊÌâÌáµÄÌ«ÓÐˮƽÁË£¡

©ÁËÒ»µã, ÊÇÈ¡×î´óµÄÊý×ÖÔÙ¼Ó1, ÈçÓжϺÅÔòÈ¡¶ÏºÅ

ÒýÓÃ
±í tableA
no  type
1    A
2    A
4    A
5    A
2    B
3    B

ÓÃÒ»ÌõSQLÓï¾äµÃ³ö,no×Ö¶ÎÖÐÒÔtype·Ö×é×î´óµÄÊý×Ö,ÈçÖмäÓжϺÅÔòÈ¡¶ÏºÅ
no  type
3    A
4    B


°´Â¥Ö÷µÄÃèÊö£¬½á¹ûÓ¦¸ÃÊÇ
NO TYPE
3  A
3  B


¸É£¬ ºÄÁ˰ëÌìÖÕÓÚ¸ã³ö½á¹ûÀ´ÁË


SQL code



Co


Ïà¹ØÎÊ´ð£º

sql¿ÉÒÔÓÐÁ½¸öÒÔÉϵĴ¥·¢Æ÷Â𣿣¿

sql¿ÉÒÔÓÐÁ½¸öÒÔÉϵĴ¥·¢Æ÷Â𣿣¿ÎÒÖ¸µÄÊÇfor´¥·¢Æ÷£¬ÄÇÆäËûµÄÄØ£¿£¿
ʲôÒâ˼£¿

¿ÉÒÔµÄ

10¸ö¶¼Ã»ÎÊÌâ

¿ÉÊÇÎÒдÁËÁ½¸öfor insert ´¥·¢Æ÷£¬Ôì³É½ø³Ì×èÈûÁËÄØ£¿Ôõô°ìÄØ£¿Çë¸ßÈËÖ¸µã
......

sqlת»»ÎÊÌ⣬¼±£¡ - ÉçÇøÖ§³Ö / ¡¶³ÌÐòÔ±¡·ÔÓÖ¾

select convert(varchar(50),cast(convert(numeric(18,2),1275674000000/100000000)as real))+'ÒÚ'
select cast(convert(numeric(18,2),1275674000000/100000000)as real)
ΪʲôÉÏÒ»¸öÓÃvarcharת»»ºó¾ÍÖ»±£ÁôÁËÒ ......

pl/SqlÈçºÎ²éѯ×Ö·û´®°üÀ¨%

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

UP

SELECT * from a ......

Èç¹ûдµÝ¹ésqlÓï¾ä - MS-SQL Server / Ó¦ÓÃʵÀý

ÓÐÁ½¸öͬÑùµÄ±í½á¹¹ 
±í½á¹¹ÈçÏ£º
  id£¨ÐòºÅ£© parentid £¨¸¸½áµãÐòºÅ£© name(½áµãÃû³Æ)
 ±í1 ¼Ç¼ 1 0 aaa
  2 ......

sql ´æ´¢¹ý³Ì

ÎÒÒª×öÒ»¸ö¶¨µãʼþ£¬ÊÇÿÌìÍíÉÏ12µã¾Í°ÑÈý¸ö±íÀïµÄÐÅÏ¢·ÅÈëÒ»¸ö±íÀÎÒÏëÓô洢¹ý³ÌÀ´Ð´£¬ÔõÃ´Ð´ÄØ£¿£¬ÄÇλ¸ßÊÖ°ï°ïæ°É£¬·Ç³£¸Ðл£¡

Óû§ÃûÊÇΨһµÄ
±íA  ×Ö¶Î
Óû§Ãû£ºName  ,ÓÊÏ䣺Ema ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ