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

SQLÖÐÈçºÎÓÃÒ»¸ö±í¸üÐÂÁíÒ»¸ö±í

for ACCESS :
update a, b set a.name=b.name1 where a.id=b.id
for SQL Server:
"update a set a.name=b.name1 from a,b where a.id=b.id"
update   a   set   a.status=b.status  
  from   table1   a,table2   b  
  where   a.id1=b.id1  
update a inner join b on a.a1=b.b1 set a.a2=b.b2Ìõ¼þ
update   table1   set   a.status   =   b.status  
  from   table1   a   inner   join   table2   b    
  on   a.idl   =   b.idl
http://topic.csdn.net/t/20041013/14/3451961.html
http://www.cnblogs.com/hanguoji/archive/2007/02/01/636723.aspx


Ïà¹ØÎĵµ£º

ÈýÖÖSQL·ÖÒ³·¨

±íÖÐÖ÷¼ü±ØÐëΪ±êʶÁУ¬[ID] int IDENTITY (1,1)
1.·ÖÒ³·½°¸Ò»£º(ÀûÓÃNot InºÍSELECT TOP·ÖÒ³)
Óï¾äÐÎʽ£º 
SELECT TOP Ò³¼Ç¼ÊýÁ¿ *
from ±íÃû
WHERE (ID NOT IN
  (SELECT TOP (ÿҳÐÐÊý*(Ò³Êý-1)) ID
  from ±íÃû
  ORDER BY ID))
  ORDER BY ID
//×Ô¼º»¹¿ÉÒÔ¼ÓÉÏһЩ²éѯ ......

SQL×Ö·û´®´¦Àíº¯Êý´óÈ«

selectÓï¾äÖÐÖ»ÄÜʹÓÃsqlº¯Êý¶Ô×ֶνøÐвÙ×÷£¨Á´½Ósql server£©£¬
select ×Ö¶Î1 from ±í1 where ×Ö¶Î1.IndexOf("ÔÆ")=1;
ÕâÌõÓï¾ä²»¶ÔµÄÔ­ÒòÊÇindexof£¨£©º¯Êý²»ÊÇsqlº¯Êý£¬¸Ä³Ésql¶ÔÓ¦µÄº¯Êý¾Í¿ÉÒÔÁË¡£
left£¨£©ÊÇsqlº¯Êý¡£
select ×Ö¶Î1 from ±í1 where charindex£¨'ÔÆ',×Ö¶Î1£©=1;
×Ö·û´®º¯Êý¶Ô¶þ½øÖÆÊý¾Ý¡¢×Ö·û´®º ......

ѧϰSQLÓï¾äÖ®SQLÓï¾ä´óÈ«

¡¡--Óï ¾ä ¹¦ ÄÜ¡¡¡¡--Êý¾Ý²Ù×÷¡¡¡¡SELECT --´ÓÊý¾Ý¿â±íÖмìË÷Êý¾ÝÐкÍÁС¡¡¡INSERT --ÏòÊý¾Ý¿â±íÌí¼ÓÐÂÊý¾ÝÐС¡¡¡DELETE --´ÓÊý¾Ý¿â±íÖÐɾ³ýÊý¾ÝÐС¡¡¡UPDATE --¸üÐÂÊý¾Ý¿â±íÖеÄÊý¾Ý¡¡¡¡--Êý¾Ý¶¨Òå¡¡¡¡CREATE TABLE --´´½¨Ò»¸öÊý¾Ý¿â±í¡¡¡¡DROP TABLE --´ÓÊý¾Ý¿âÖÐɾ³ý±í¡¡¡¡ALTER TABLE --ÐÞ¸ÄÊý¾Ý¿â±í½á¹¹¡¡¡¡CREATE VI ......

SQLËæ»ú²éѯ

SQL Server£º
Select TOP N * from TABLE Order By NewID()  
Select TOP N * from TABLE Order By NewID()
NewID()º¯Êý½«´´½¨Ò»¸ö uniqueidentifier ÀàÐ͵ÄΨһֵ¡£ÉÏÃæµÄÓï¾äʵÏÖЧ¹ûÊÇ´ÓTableÖÐËæ»ú¶ÁÈ¡NÌõ¼Ç¼¡£
Access£º
Select TOP N *&n ......

sql²éѯÓÅ»¯


1¡¢    ÓóÌÐòÖУ¬±£Ö¤ÔÚʵÏÖ¹¦ÄܵĻù´¡ÉÏ£¬¾¡Á¿¼õÉÙ¶ÔÊý¾Ý¿âµÄ·ÃÎÊ´ÎÊý£»Í¨¹ýËÑË÷²ÎÊý£¬¾¡Á¿¼õÉÙ¶Ô±íµÄ·ÃÎÊÐÐÊý,×îС»¯½á¹û¼¯£¬´Ó¶ø¼õÇáÍøÂ縺µ££»Äܹ»·Ö¿ªµÄ²Ù×÷¾¡Á¿·Ö¿ª´¦Àí£¬Ìá¸ßÿ´ÎµÄÏìÓ¦ËÙ¶È£»ÔÚÊý¾Ý´°¿ÚʹÓÃSQLʱ£¬¾¡Á¿°ÑʹÓõÄË÷Òý·ÅÔÚÑ¡ÔñµÄÊ×ÁУ»Ëã·¨µÄ½á¹¹¾¡Á¿¼òµ¥£»ÔÚ²éѯʱ£¬²»Òª¹ý¶àµØÊ¹Óà ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ