SQL·ÖÒ³²éѯ
thunder:
1.MYSQLʵÏÖ
mysql> select * from user;
+----+----------+----------+-----------------+
| ID | username | password | email |
+----+----------+----------+-----------------+
| 1 | admin | admin | abc@yahoo.cn |
| 2 | thomas | 159753 | thomas@yahoo.cn |
| 3 | thomas1 | 159753 | thomas@yahoo.cn |
| 4 | huhu | 159753 | hu@yahoo.cn |
| 5 | fdg | dfg | fdg |
| 6 | sdf | sd | sdf@yahoo.cn |
| 7 | d | d | d@d.cn |
+----+----------+----------+-----------------+
7 rows in set (0.00 sec)
mysql> select * from user limit 3,2;
+----+----------+----------+-------------+
| ID | username | password | email |
+----+----------+----------+-------------+
| 4 | huhu | 159753 | hu@yahoo.cn |
| 5 | fdg | dfg | fdg |
+----+----------+----------+-------------+
2 rows in set (0.00 sec)
mysql>
===================================================
2.MSSQLServerʵÏÖ
select top 5 function_id,function_name from d_function
where function_id not in (select top 5 function_id from d_function)
6 ÔÂͳ¼Æ
7 ²¿ÃŲéѯ
8 ¹«Ë¾²éѯ
9 ¹¤³ÌÕбê
10 ¹¤³Ì×ܽá
Ïà¹ØÎĵµ£º
Èç¹ûÄã¾³£Óöµ½ÏÂÃæµÄÎÊÌ⣬Äã¾ÍÒª¿¼ÂÇʹÓÃSQL ServerµÄÄ£°åÀ´Ð´¹æ·¶µÄSQLÓï¾äÁË£º
SQL³õѧÕß¡£
¾³£Íü¼Ç³£ÓõÄDML»òÊÇDDL SQL Óï¾ä¡£
ÔÚ¶àÈË¿ª·¢Î¬»¤µÄSQLÖУ¬Ã¿¸öÈ˶¼ÓÐ×Ô¼ºµÄSQLϰ¹ß£¬Ã»ÓÐÒ»Ì×ͳһµÄ¹æ·¶¡£
ÔÚSQL Server Management StudioÖУ¬ÒѾ¸ø´ó¼ÒÌṩÁ˺ܶೣÓõÄÏÖ³ÉSQL¹æ·¶Ä£°å¡£
SQL Server Management ......
ÔÚȡһ¸öƽ¾ùÖµµÄʱºòÍùÍùÓöµ½Ð¡ÊýµãλÊýµÄ½ØÈ¡¡£
ǰ¼¸ÌìÓöµ½¹ýÕâô¸öÎÊÌ⣬ÔÚKingDee EAS µÄ²éѯ·ÖÎöÆ÷ÀïÃæÈç¹ûÇóijһÎïÁÏµÄÆ½¾ùµ¥¼ÛʱÎÒÕâÑùдµÀ£º
select avg = case sum(bentry.FQuantity) when 0 then 0 else (sum(bentry.famount)/sum(bentry.FQuantity)) end,
´ËÓï¾ä¿´ËÆÃ»Ê²Ã´ÎÊÌ⣬±Ï¾¹ÊÇÇ󯽾ùÖµ£¬¿ÉÊÇÈç¹ûÒªÔ ......
ÔÚÊý¾Ý¿âÓ¦ÓõÄÉè¼ÆÖУ¬ÎÒÃÇÍùÍù»áÐèÒª»ñȡijЩ±íµÄ¼Ç¼×ÜÊý£¬ÓÃÓÚÅжϱíµÄ¼Ç¼×ÜÊýÊÇ·ñ¹ý´ó£¬ÊÇ·ñÐèÒª±¸·ÝÊý¾ÝµÈ¡£ÎÒÃÇͨ³£µÄ×ö·¨ÊÇ£ºselect count(*) as c from tableA ¡£È»¶ø¶ÔÓڼǼÊý¾Þ´óµÄ±í£¬ÉÏÊö×ö·¨½«»á·Ç³£ºÄʱ¡£ÔÚDELL 4400 ·þÎñÆ÷ÉÏ×öÊÔÑ飬MS Sqlserver 2000 Êý¾Ý¿â¶ÔÓÚ100Íò¼Ç¼µÄ¼òµ¥Êý¾Ý±íÖ´ÐÐÉÏÊöÓï¾ä£¬Ê± ......
ÕýÈ·µÄÐ޸ķ½·¨£ºsqlÅúÁ¿ÐÞ¸Ä×Ö¶ÎÄÚÈݵÄÓï¾ä
1¡¢Ã»ÊÔ¹ý£¬ÍøÉÏËÑË÷µÄ
ÒýÓÃ
update '±íÃû' set ÒªÐÞ¸Ä×Ö¶ÎÃû = replace (ÒªÐÞ¸Ä×Ö¶ÎÃû,'±»Ìæ»»µÄÌØ¶¨×Ö·û','Ìæ»»³ÉµÄ×Ö·û')
2¡¢×Ô¼º°´ÕÕÒ»¸öÒ»¸öÐÞ¸ÄÊÇ¿´Êý¾Ý±í×ܽáµÄ
ÀýÈçżÐÞ¸Ä×Ô¼º²©¿Íboblog_replies±íÖеÄadminrepidºÍadminreplier×Ö¶ÎÖµ£º
UPDATE `xxx`.`boblog_ ......
£¨18£©ÓÃEXISTSÌæ»»DISTINCT£º
µ±Ìá½»Ò»¸ö°üº¬Ò»¶Ô¶à±íÐÅÏ¢(±ÈÈ粿ÃűíºÍ¹ÍÔ±±í)µÄ²éѯʱ,±ÜÃâÔÚSELECT×Ó¾äÖÐʹÓÃDISTINCT¡£Ò»°ã¿ÉÒÔ¿¼ÂÇÓÃEXISTÌæ»», EXISTS ʹ²éѯ¸üΪѸËÙ,ÒòΪRDBMSºËÐÄÄ£¿é½«ÔÚ×Ó²éѯµÄÌõ¼þÒ»µ©Âú×ãºó,Á¢¿Ì·µ»Ø½á¹û¡£Àý×Ó£º
(µÍЧ):
SELECT DISTINCT DEPT_NO,DEPT_NAME  ......