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

SQLÖØ¸´¼Ç¼²éѯ

 SQLÖØ¸´¼Ç¼²éѯ
1¡¢²éÕÒ±íÖжàÓàµÄÖØ¸´¼Ç¼£¬Öظ´¼Ç¼ÊǸù¾Ýµ¥¸ö×ֶΣ¨peopleId£©À´ÅжÏ
select * from people
where peopleId in (select   peopleId from   people group by   peopleId having count
(peopleId) > 1)
2¡¢É¾³ý±íÖжàÓàµÄÖØ¸´¼Ç¼£¬Öظ´¼Ç¼ÊǸù¾Ýµ¥¸ö×ֶΣ¨peopleId£©À´Åжϣ¬Ö»ÁôÓÐrowid×îСµÄ¼Ç¼
delete from people
where peopleId in (select   peopleId from people group by   peopleId   having count
(peopleId) > 1)
and rowid not in (select min(rowid) from   people group by peopleId having count(peopleId
)>1)
3¡¢²éÕÒ±íÖжàÓàµÄÖØ¸´¼Ç¼£¨¶à¸ö×ֶΣ©
select * from vitae a
where (a.peopleId,a.seq) in   (select peopleId,seq from vitae group by peopleId,seq having
count(*) > 1)
4¡¢É¾³ý±íÖжàÓàµÄÖØ¸´¼Ç¼£¨¶à¸ö×ֶΣ©£¬Ö»ÁôÓÐrowid×îСµÄ¼Ç¼
delete from vitae a
where (a.peopleId,a.seq) in   (select peopleId,seq from vitae group by peopleId,seq having
count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)
5¡¢²éÕÒ±íÖжàÓàµÄÖØ¸´¼Ç¼£¨¶à¸ö×ֶΣ©£¬²»°üº¬rowid×îСµÄ¼Ç¼
select * from vitae a
where (a.peopleId,a.seq) in   (select peopleId,seq from vitae group by peopleId,seq having
count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)


Ïà¹ØÎĵµ£º

AccessºÍSQL2000ÖÐÓï¾äµÄÇø±ð

1 £¬¶ÔÓÚÈÕÆÚ×Ö¶Î×Ö¶Î
access±íʾΪ£º#1981-28-12#
SQLSERVER2000±íʾΪ£º''1981-02-12''
2,SQLÓï¾äÇø±ð£¬select ,update ÔÚ¶Ôµ¥±í²Ù×÷ʱ¶¼²î²»¶à£¬
µ«¶à±í²Ù×÷ʱupdateÓï¾äµÄÇø±ðACCESSÓëSQLSERVERÖеÄUpdateÓï¾ä¶Ô±È:
SQLSERVERÖиüжà±íµÄUpdateÓï¾ä:
Update Tab1
SET a.Name = b.Name
from Tab1 a,Tab2 b
Whe ......

JAVAÁ¬½ÓACCESS£¬SQL Server,MySQL,Oracle

import java.sql.*;
/*
* JAVAÁ¬½ÓACCESS£¬SQL Server,MySQL,OracleÊý¾Ý¿â
*
* */
public class JDBC {
  
public static void main(String[] args)throws Exception {
  
   Connection conn=null;
  
       //====Á¬½ÓACCESSÊý¾Ý¿â ......

[ÊÕ£] ÓÃsqlite Ö´Ðбê×¼ sql Óï·¨

http://www.umgr.com/blog/PostView.aspx?bpId=36294
 1. Ö´ÐÐsqlÓï¾ä
int sqlite3_exec(sqlite3*£¬ const char *sql£¬ sqlite3_callbacksql Óï·¨
£¬ void *£¬  char **errmsg );
Õâ¾ÍÊÇÖ´ÐÐÒ»Ìõ sql Óï¾äµÄº¯Êý¡£
µÚ1¸ö²ÎÊý²»ÔÙ˵ÁË£¬ÊÇÇ°Ãæopenº¯ÊýµÃµ½µÄÖ¸Õ롣˵ÁËÊǹؼüÊý¾Ý½á¹¹¡£
µÚ2¸ö²ÎÊýconst char ......

oracle SQLÐÔÄÜÓÅ»¯

ÎÒÃÇÒª×öµ½²»µ«»áдSQL,»¹Òª×öµ½Ð´³öÐÔÄÜÓÅÁ¼µÄSQL,ÒÔÏÂΪ±ÊÕßѧϰ¡¢ÕªÂ¼¡¢²¢»ã×ܲ¿·Ö×ÊÁÏÓë´ó¼Ò·ÖÏí£¡
£¨1£©      Ñ¡Ôñ×îÓÐЧÂʵıíÃû˳Ðò(Ö»ÔÚ»ùÓÚ¹æÔòµÄÓÅ»¯Æ÷ÖÐÓÐЧ)£º
ORACLEµÄ½âÎöÆ÷°´ÕÕ´ÓÓÒµ½×óµÄ˳Ðò´¦Àífrom×Ó¾äÖеıíÃû£¬from×Ó¾äÖÐдÔÚ×îºóµÄ±í(»ù´¡±í driving table)½«±»×îÏÈ´¦Àí£ ......

sqlÓï¾äµÄʹÓÃ

ÒÔÏÂÊÇÎÒÔÚѧϰÖеĵãµÎ¼Ç¼£¬Èç¹ûÓдíÎóµÄµØ·½»òÕßȱÉÙ²¿·Ö£¬Çë¸÷λ´óÏÀ²»ÁßÖ¸½Ì¡£Ð¡µÜÔÚ´Ëл¹ýÁË
1.select count£¨*£© ºÍselect count£¨id£© Ö®¼äµÄÇø±ð¡£
select count(*) ͳ¼ÆËùÓмǼ¸öÊý£¬°üÀ¨¿Õ¼Ç¼¡£
Select count(Id) ͳ¼ÆËùÓмǼ¸öÊý£¬²»°üÀ¨null¼Ç¼¡£
2.delete & truncate µÄÇø±ð
trunc ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ