½ðɳ¼¯ÍŹÙÍø

  • Ê×Ò³
  • Ãâ·Ñ¿´¿Î
  • Ñ¡¿Î
  • Ìâ¿â
  • APPÏÂÔØ
µÇ¼ ×¢²á
ÄúµÄλÖãºÊ×Ò³ > ²ÆÎñÈí¼þ > ÕýÎÄ

½ðɳ¼¯ÍŹÙÍø:²ÆÎñÈí¼þÖ®´ÓÆäËû±¨±íÈ¡Êý¼ÆËã

2018-09-03 11:01     À´Ô´£º½ðɳ¼¯ÍŹÙÍø     
ÔÚ½øÐб¨±íÓ뱨±í¼äµÄÈ¡Êýʱ£¬²»½ö½öÒª¿¼ÂÇÈ¡ÄÄÒ»¸ö±íÄÄÒ»¸öµ¥ÔªµÄÊý¾Ý£¬»¹Òª¿¼ÂÇÊý¾ÝÔ´ÔÚÄÄÒ»Ò³¡£ÀýÈ磬5Ô·ݵÄ×ʲú¸ºÕ®±íÖеÄÀûÈó£¬ÐèҪȥ°ÁÀûÈó±íÖÐ5Ô·ݵÄÀûÈóÊý¾Ý£¬¼ÙÈçÀûÈó±íÖдæÔÚÆäËûÔ·ݵÄÊý¾Ý£¬¶ø²»´æÔÚ5Ô·ݵÄÊý¾Ý£¬ÄÇô¡¶×ʲú¸ºÕ®±í¡·¾ø¶Ô²»Ó¦¸Ã½«ÆäËûÔ·ݵÄÊý¾ÝÈ¡³öÀ´£¬±¨±í¼äµÄ¼ÆË㹫ʽ¾ÍÊÇÒª±£Ö¤ÕâÒ»µã¡£¡¡¡¡±¨±í¼äµÄ¼ÆË㹫ʽÓëͬһ±¨±íÄÚ¸÷±íÒ³¼äµÄ¼ÆË㹫ʽºÜÏà½ü£¬Ö÷ÒªÇø±ð¾ÍÊǰѱ¾±í±íÃû»»ÎªËû±í±íÃû¡£±¨±íÓ뱨±í¼äµÄ¼ÆË㹫ʽ·ÖΪ£ºÈ¡Ëû±íÈ·¶¨Ò³ºÅ±íÒ³µÄÊý¾ÝºÍÓùØÁªÌõ¼þ´ÓËû±íÈ¡Êý¡£¡¡¡¡(1)È¡Ëû±íÈ·¶¨Ò³ºÅ±íÒ³µÄÊý¾Ý¡£ÓÃÒÔϸñʽ¿ÉÒÔ·½±ãµØÈ¡µÃÒÑÖªÒ³ºÅµÄËû±í±íÒ³Êý¾Ý£º¡¡¡¡<Ä¿±êÇøÓò>=“<Ëû±í±íÃû>”→ <Êý¾ÝÔ´ÇøÓò> [£À <Ò³ºÅ> ]¡¡¡¡µ±<Ò³ºÅ>ȱʡʱΪ±¾±í¸÷Ò³·Ö±ðÈ¡Ëû±í¸÷Ò³Êý¾Ý¡£ÏÂÃæ¾Í¸Ã¸ñʽ¾ÙһЩÀý×Ó¡£¡¡¡¡¢ÙÈ¡Ëû±íÊý¾Ý¡£Áǰ±íÒ³D5µÄÖµµÈÓÚ±í“Y”µÚ4Ò³D5µÄÖµ£ºD5£½“Y”→D5£À4£»Áî±¾±í¸÷Ò³D5µÄÖµµÈÓÚ±í“Y”¸÷Ò³D5µÄÖµ£ºD5£½“Y”→D5 FOR ALL£»Áǰ±íËùÓбíÒ³ C5µÄÖµµÈÓÚ±í“Y”µÚ 1Ò³ÖÐC10 µÄÖµÓë±í“Y”µÚ2Ò³ÖÐC2µÄÖµÖ®ºÍ£ºC5=“Y” →C10£À1£«“Y”£­C2£À2¡¡¡¡¢ÚÈ¡Ëû±í¼°±¾±íµÄÊý¾Ý¡£Áǰ±íËùÓбíÒ³C5µÄÖµµÈÓÚ±í“Y”µÚ1Ò³ÖÐC10µÄÖµÓ뵱ǰ±íµÚ2Ò³ÖÐC2µÄÖµÖ®ºÍ£ºC5£½“Y”→C10£Àl£«C2£À2¡£¡¡¡¡¢ÛÈ¡ÆäËûÁ½¸ö±íµÄÊý¾Ý¡£µ±Ç°±í C1£¾0µÄ±íÒ³ D5µÄÖµµÈÓÚ±í“Y”µÚ1Ò³ÖÐ H20µÄÖµÓë±í“X”µÚ2Ò³ÖÐF4µÄÖµÖ®ºÍ£ºD5£½“Y”→H20£Àl£«“X”→E4£À2 FOR C1£¾0¡£¡¡¡¡¢Ü¿É±äÇø¹«Ê½¡£ÔÚÃüÁî´°»òÅúÃüÁîÖУ¬Áǰ¿É±ä±í C1>0µÄ±íÒ³V_DµÄÖµµÈÓÚ±í“Y”µÚ1Ò³ÖÐV_HµÄÖµÓë±í“X” µÚ2Ò³ÖÐV_LµÄÖµÖ®ºÍ£ºLET V_D =“Y”→V_H£Àl£«“X”→V_L£À2 FOR C1£¾0¡£¡¡¡¡£¨2£©ÓùØÁªÌõ¼þ´ÓËû±íÈ¡Êý¡£µ±´ÓËû±íÈ¡Êýʱ£¬ÒÑÖªÌõ¼þ²¢²»ÊÇÒ³ºÅ£¬¶øÊÇÏ£Íû°´ÕÕÄê¡¢Ô¡¢Èյȹؼü×ֵĶÔÓ¦¹ØϵÀ´È¡Ëû±íÊý¾Ý£¬¾Í±ØÐëÓõ½¹ØÁªÌõ¼þ¡£±íÒ³¹ØÁªÌõ¼þµÄÒâÒåÊǽ¨Á¢±¾±íÓëËû±íÖ®¼äÒԹؼü×Ö»òij¸öµ¥ÔªÎªÁªÏµµÄĬÆõ¹Øϵ¡£´ÓËû±íÈ¡ÊýµÄ¹ØÁªÌõ¼þµÄ¸ñʽΪ£º¡¡¡¡RELATION <µ¥Ôª|¹Ø¼ü×Ö|±äÁ¿|³£Á¿>WITH“<Ëû±í±íÃû>”→<µ¥Ôª|¹Ø¼ü×Ö|±äÁ¿|³£Á¿>¡¡¡¡¾ßÌåÓ÷¨ÎÒÃÇÒÔÀý×Ó˵Ã÷¡£ÀýÈ磺A1£½“FYB”→A1 FOR ALL RELATIONÔÂWITH“FYB”→Ô£¬ÒâÒåΪȡFYB±íµÄ£¬Ó뵱ǰ±íÒ³ÔÂÏàͬÔµÄA1µ¥ÔªµÄÖµ¡£Èç¹ûµ±Ç°±íҳΪ9Ô£¬ÔòÈ¡FYB±í9Ô±íÒ³A1µÄÖµ£»A£½“LRB”→BRELATIONÔ WITH “LRB” →ÔÂÊ®1£¬ÒâÒåΪÁî±¾±í¸÷Ò³AÁÐÈ¡±í“LRB”ÉÏÔ¸÷Ò³ BÁÐÊýÖµ£»A£½“LRB”→A RELATIONÄê WITH“LRB”→Ä꣬ÔÂWITH“LRB”→ÔÂ+l, ÒâÒåΪÁǰ±í¸÷ÏîAÁÐÈ¡±í“LRB” ͬÄêÉÏÔÂAÁÐÊýÖµ£»A£½“LRB”→B FOR ALL RELATlON 1 WITH “LRB”→Ô£¬Áǰ±í¸÷Ò³AÁÐÈ¡±í“LRB”1ÔÂBÁÐÊýÖµ£»A£½“LRB”→B£«“ZJB”→C RELATIONÄê WITH“LRB”→Ä꣬ÔÂWITH“LRB”→Ô£¬ÄêWITH“ZJB”→Ä꣬ÔÂWITH“ZJB”→Ô£¬Áǰ±í¸÷Ò³AÁÐÈ¡±í“LRB” ͬÄêÉÏÔ±íÒ³BÁÐÊýÖµ¼°±í“ZJB”ÉÏÒ»ÄêÏàͬÔ·ݱíÒ³CÁÐÊýÖµÖ®ºÍ¡£
Ãâ·Ñ¿´¿Î
ÍøУ¿Î³Ì
³õ¼¶»á¼Æ
½ðɳ¼¯ÍŹÙÍø»á¼Æ
×¢²á½ðɳ¼¯ÍŹÙÍø
Ë°Îñʦ
¸ß¼¶½ðɳ¼¯ÍŹÙÍø
¹ÜÀí½ðɳ¼¯ÍŹÙÍø
»á¼ÆÐÂÊÖ°à
±¨Ë°Êµ²Ù
»á¼Æʵ²ÙÖ¤Êé
Ãâ·ÑÌâ¿â
ÈÈÃÅÍƼö

΢ÐŹ«ÖÚºÅ

Èø¶÷¿ÎÌÃ

×Éѯµç»°£º400-888-3585

ÔÚÏß¿Í·þ£ºµã»÷×Éѯ

©2001-2023 ½ðɳ¼¯ÍŹÙÍø£¨CANET) All Rights Reserved ÔËÓªÖ§³Ö£º±±¾©Èø¶÷½ÌÓý¿Æ¼¼ÓÐÏÞ¹«Ë¾

ʵÃûÍøÕ¾ÈÏÖ¤ ¾©¹«Íø°²±¸11010502037473ºÅ ¾©ICP±¸12013966ºÅ

½ðɳ¼¯ÍŹÙÍøappÏÂÔØÍøÒ³°æ - ½ðɳ¼¯ÍŹÙÍøappÏÂÔØÍøÒ³°æ¹Ù·½Ö÷Ò³Á´...