access ·ÖÒ³Óà SQL²éѯÓï¾ä
select top ÿҳÏÔʾµÄ¼Ç¼Êý * from topic where id not in (select top £¨µ±Ç°µÄÒ³Êý-1£©×ÿҳÏÔʾµÄ¼Ç¼Êý id from topic order by id desc) order by id desc
select top ÿҳÏÔʾµÄ¼Ç¼Êý * from topic where id not in (select top £¨µ±Ç°µÄÒ³Êý-1£©×ÿҳÏÔʾµÄ¼Ç¼Êý id from topic order by id desc) order by id desc
Ïà¹ØÎĵµ£º
ÔÚT-sqlµÄд·¨ÉÏÓкܴóµÄ½²¾¿£¬ÏÂÃæÁгö³£¼ûµÄÒªµã£ºÊ×ÏÈ£¬DBMS´¦Àí²éѯ¼Æ»®µÄ¹ý³ÌÊÇÕâÑùµÄ£º
1¡¢²éѯÓï¾äµÄ´Ê·¨¡¢Óï·¨¼ì²é
2¡¢½«Óï¾äÌá½»¸øDBMSµÄ²éѯÓÅ»¯Æ÷
3¡¢ÓÅ»¯Æ÷×ö´úÊýÓÅ»¯ºÍ´æÈ¡Â·¾¶µÄÓÅ»¯
4¡¢ÓÉÔ¤±àÒëÄ£¿éÉú³É²éѯ¹æ»®
5¡¢È»ºóÔÚºÏÊʵÄʱ¼äÌá½»¸øÏµÍ³´¦ÀíÖ´ÐÐ
6¡¢×îºó½«Ö´Ðнá¹û·µ»Ø¸øÓû§¡£
Æä´Î£¬¿´Ò»ÏÂS ......
CyberSavvy ¼áÐÅÈí¼þ×Ô¶¯»¯¿ÉÒÔÈÿͻ§ÇáËÉÏíÊÜÉú»î¡£DataPlace ÊǸù«Ë¾µÄÈí¼þ¼´·þÎñ½â¾ö·½°¸£¬Ò²¿É³ÆÖ®Îª“Êý¾Ý¿â¹¤³§”£¬ËüÄܹ»ÈÃÃæÏò¼¼ÊõÒÔ¼°ÃæÏòÉÌÎñµÄÓû§´´½¨²¢ÐÞ¸Ä×Ô¼ºµÄÊý¾Ý¿â£¬¶øCyberSavvy ¹«Ë¾½«Îª¸ÃÊý¾Ý¿âÌṩÍйܷþÎñ¡£Òò´ËCyberSavvy ¹«Ë¾ÐèÒªÅÍʯ°ã¼á¹ÌµÄÊý¾Ý¿â£¬²¢Í¨¹ýÍòÎÞһʧµÄÊý¾Ý´«Êä»úÖÆÀ´Ö ......
ÔÎÄ£ºÁõÎä| ³£ÓõÄORACLE PL/SQL¹ÜÀíÃüÁîÒ»
ÊìϤORACLE¹ÜÀíµÄÒ»¶¨¶ÔÕâЩÃüÁî²»»áİÉú£¬²»¹ý¶ÔÓÚÎÒÕâ¸ö¸Õ½Ó´¥ORACLE¹ÜÀíµÄÀ´Ëµ£¬»¹ÊÇÓбØÒª×öϼǼ£¬ÒÔ±ãËæÊ±²é¿´¡£
Ò» µÇ¼SQLPLUS
sqlplus Óû§Ãû/ÃÜÂë@Êý¾Ý¿âʵÀý as µÇ¼½ÇÉ«;
Èç:Óû§sys(ÃÜÂëΪ123)ÒÔsysdbaµÄ½ÇÉ«µÇ¼Êý¾Ý¿âORACL£¬ÎÒÃÇ¿ÉÒÔÊäÈ룺sqlplus sy ......
ÈçºÎÐÞ¸ÄSQL ServerµÄÁ¬½ÓÊý
ÎÒ°ÑSQL Server 7.0µÄÓû§Á¬½ÓÊýÉèΪ1ºó£¬Êý¾Ý¿â¾ÍÔÙÒ²Á¬²»ÉÏÁË£¬ËùÒÔҲû°ì·¨ÐÞ¸ÄÁ¬½ÓÊý
ÇëÎÊÓÐʲô°ì·¨ÄÜÐÞ¸ÄÁ¬½ÓÊý£¿
ÔÚserver µÄÊôÐÔÀïÃæÓиöconnetctions µÄ
maximun concurr ......