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3.1.2ʵÌåÎĵµ Entity name Description ¿Í»§ Ô±¹¤ ÊÕ¼þÈË ÆÀ¼Û ²Ö¿â

Ìá½»»õÎï ¹ÜÀí¹«Ë¾»òÕßÅäËÍ»õÎï ÊÕÈ¡»õÎïµÄÈË ¿Í»§¶Ô¿ìµÝ·þÎñµÄÆÀ¼Û ´¢´æ»õÎïµÄµØ·½ £¨²Î¿¼p126ͼ9-2£© Occurrence ¹«Ë¾ÓµÓжà¸ö¿Í»§ ¶àÃûÔ±¹¤ Ò»¸öÔ˵¥°üº¬Ò»¸öÊÕ¼þÈË Óû§Ö»ÄÜÆÀ¼ÛÒ»´Î ÓµÓжà¸ö²Ö¿â

3.3ʵÌåºÍ¹ØÏµµÄÓйØÊôÐÔ £¨Ó¦¸Ã¸ø³öʵÌåºÍ¹ØÏµµÄËùÓÐÊôÐÔ£¬À©Õ¹p132ͼ9-8µÄÁÐÃûΪ£ºÊµÌå/¹ØÏµÃû¡¢ÊôÐÔ¡¢ÃèÊö¡¢¼ü£¨Ö÷¼ü/ºîÑ¡¼ü£©¡¢Êý¾ÝÀàÐͺͳ¤¶È¡¢ÊÇ·ñΪ¿Õ¡¢ÊÇ·ñ¶àÖµ¡¢ÊÇ·ñ¸´ºÏ¡¢ÊÇ·ñÅÉÉú¡¢Ä¬ÈÏÖµ¡¢ÊôÐÔÓòÔ¼Êø£©

¿Í»§ÐÅÏ¢±í kehu

ÁÐÃû khno khname khtel khsex khadd

Êý¾ÝÀàÐÍ varchar(20) varchar(20) varchar(20) varchar(10) varchar(20) ¿É·ñΪ¿Õ NOT NULL NOT NULL NOT NULL NOT NULL ˵Ã÷ ¿Í»§±àºÅ ¿Í»§ÐÕÃû ¿Í»§µç»° ¿Í»§ÐÔ±ð ¿Í»§µØÖ· Ö÷/Íâ¼ü Ö÷¼ü check( khsex in (¡°ÄС±,¡±Å®¡±) )

Ô±¹¤ÐÅÏ¢±í yuangong ÁÐÃû ygno ygname ygpos ygsex ygage ygtel Êý¾ÝÀàÐÍ varchar(20) varchar(20) varchar(20) varchar(5) int varchar(20) ¿É·ñΪ¿Õ NOT NULL NOT NULL NOT NULL NOT NULL NOT NULL NOT NULL ˵ Ã÷ Ô±¹¤±àºÅ Ô±¹¤ÐÕÃû Ô±¹¤Ö°Îñ Ô±¹¤ÐÔ±ð Ô±¹¤ÄêÁä Ô±¹¤µç»° Ö÷/Íâ¼ü Ö÷¼ü check( ygsex in (¡°ÄС±,¡±Å®¡±) ) check(ygage>18 and ygage<65 )

check( ygpos in (¡°¾­Àí¡±,¡±Ö÷¹Ü¡±,¡±¿ìµÝÔ±¡±) )

ÊÕ»õÈËÐÅÏ¢±í shouhuoren ÁÐÃû shrno shrname shrsex shradd shrtel Êý¾ÝÀàÐÍ varchar(20) varchar(20) varchar(10) varchar(20) varchar(20) ¿É·ñΪ¿Õ NOT NULL NOT NULL NOT NULL NOT NULL ˵ Ã÷ ÊÕ»õÈ˱àºÅ ÊÕ»õÈËÐÕÃû ÊÕ»õÈËÐÔ±ð ÊÕ»õÈ˵ØÖ· ÊÕ»õÈ˵绰 Ö÷/Íâ¼ü Ö÷¼ü check( shrsex in (¡°ÄС±,¡±Å®¡±) )

²Ö¿â cangku ÁÐÃû ckno ckadd Êý¾ÝÀàÐÍ varchar(20) varchar(50) ¿É·ñΪ¿Õ NOT NULL NOT NULL

˵ Ã÷ ²Ö¿â±àºÅ ÏêϸµØÖ· Ö÷/Íâ¼ü Ö÷¼ü ckarea cktel ckcap ckweight varchar(50) varchar£¨20£© int int NOT NULL NOT NULL NOT NULL NOT NULL ¸ºÔðÇøÓò ²Ö¿âµç»° ²Ö¿âÈÝÁ¿ ÒÔ´æ»õÎïÖØÁ¿ check( ckarea in (¡°ÉϺ£¡±,¡±±±¾©¡±,¡±ÏÃÃÅ¡±,¡±Î人¡±,¡±¹ãÖÝ¡±))

Ô˵¥ÐÅÏ¢±í yundan ÁÐÃû ydno ydprice ydstate shrno khno hwweight sltime

Êý¾ÝÀàÐÍ varchar(20) int varchar(20) varchar(20) varchar(20) int varchar(20) ¿É·ñΪ¿Õ NOT NULL NOT NULL NOT NULL NOT NULL NOT NULL ˵ Ã÷ »õµ¥±àºÅ ÔË·Ñ×Ü¼Û Ô˵¥×´Ì¬ ÊÕ»õÈ˱àºÅ ¿Í»§±àºÅ »õÎïÖØÁ¿ ÊÜÀíʱ¼ä Ö÷/Íâ¼ü Ö÷¼ü Íâ¼ü Íâ¼ü check(ydstate in (¡°½ÓÊÜ¡±,¡±ÅÉËÍ¡±,¡±Íê³É¡±,¡±È¡Ïû¡±) תÔËÐÅÏ¢ zhuanyun ÁÐÃû zyno ydno ckno ygno qstime rktime

ÅäËÍÐÅÏ¢ peisong Êý¾ÝÀàÐÍ varchar(20) varchar(20) varchar(20) varchar(20) varchar(20) varchar(20) ¿É·ñΪ¿Õ NOT NULL NOT NULL NOT NULL ˵Ã÷ תÔ˱àºÅ Ô˵¥±àºÅ ²Ö¿â±àºÅ Ô±¹¤±àºÅ ÆðËÍʱ¼ä Èë¿âʱ¼ä Ö÷/Íâ¼ü Ö÷¼ü Íâ¼ü Íâ¼ü Íâ¼ü ÁÐÃû psno ydno ygno cktime wctime ckno

ÆÀ¼ÛÐÅÏ¢ pingjia Êý¾ÝÀàÐÍ varchar(20) varchar(20) varchar(20) varchar(20) varchar(20) varchar(20) ¿É·ñΪ¿Õ NOT NULL NOT NULL NOT NULL ˵Ã÷ ÅäËͱàºÅ Ô˵¥±àºÅ Ô±¹¤±àºÅ ³ö¿âʱ¼ä Íê³Éʱ¼ä ²Ö¿â±àºÅ Ö÷/Íâ¼ü Ö÷¼ü Íâ¼ü Íâ¼ü Íâ¼ü ÁÐÃû pjno ydno speed Êý¾ÝÀàÐÍ varchar(20) varchar(20) int ¿É·ñΪ¿Õ NOT NULL NOT NULL NOT NULL

˵Ã÷ ÆÀ¼Û±àºÅ Ô˵¥±àºÅ ÔËÊäËÙ¶È Ö÷/Íâ¼ü Ö÷¼ü Íâ¼ü serve int NOT NULL Ô±¹¤·þÎñ total int NOT NULL ÆÀ·Ö advice varchar£¨100£© ÆÀ¼Û 3.4 ERͼ

3.5±íºÍÍâ¼üÊôÐÔ´æµµ yuangong(ygno,ygname,ygpos,ygsex,ygage,ygtel) primary key ygno kehu(khno,khname,khtel,khsex,khadd) primary key khno houhuoren(shrno,shrname,shrsex,shraddr,shrtel) primary key shrno yundan(ydno,ydprice,shrno,khno,ygno) primarykey ydno foreign key shrno reference shouhuoren(shr) foreign key khno reference shouhuoren(khno) cangku(ckno,ckadd,ckarea,cktel,ckcap,ckweight) primary key ckno zhuanyun(zyno,sno,yno,qstime,rktime) primary key zyno foreign key skno reference cangku(ckno) foreign key ygno reference yuangong(ygno) peisong(psno,shrno,ygno,cktime,qstime) primary key psno foreign key shrno reference shouhuoren foreign key ygno reference yuangong pingjia(pjno,ydno,pf,pj) primary key pjno

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