C . REVOKE UPDATE £¨XH £© ON STUD FROM U4
D . REVOKE UPDATE £¨XH £© ON STUD FF0M PUBLIC
5¡¢½«²éѯSC ±íµÄȨÏÞÊÚÓèÓû§U1£¬²¢ÔÊÐí¸ÃÓû§½«´ËȨÏÞÊÚÓèÆäËûÓû§¡£ÊµÏִ˹¦ÄܵÄSQL Óï¾äÊǣߣߡ£
A . GRANT SELECT TO SC ON Ul WITH PUBIJIC B . GRANT SELECT ON SC TO U1 WITH PUBLIC
C . GRANT SELECT TO SC ON Ul WITH GRANT OPTION D . GRANT SEIECT ON SC TO U1 WITH GRANT OPTION 6¡¢ÓÃÓÚʵÏÖÊý¾Ý´æÈ¡°²È«ÐÔµÄSQL Óï¾äÊÇ A . CREATE TABLE B . COMMIT C . GRANT ºÍREVOKE D . ROLLBACK 7¡¢ÔÚÊý¾Ý¿âϵͳÖУ¬¶Ô´æȡȨÏ޵Ķ¨Òå³ÆΪ A £®ÃüÁî B £®ÊÚȨ C £®¶¨Òå D £¬Éó¼Æ
8¡¢Êý¾Ý¿â¹ÜÀíϵͳͨ³£ÌṩÊÚȨ¹¦ÄÜÀ´¿ØÖƲ»Í¬Óû§·ÃÎÊÊý¾ÝµÄȨÏÞ£¬ÕâÖ÷ÒªÊÇΪÁËʵÏÖÊý¾Ý¿âµÄ A £®¿É¿¿ÐÔ B £®Ò»ÖÂÐÔ C £®ÍêÕûÐÔ D £®°²È«ÐÔ ¶þ¡¢×ÛºÏÌâ
1.°Ñ²éѯStudent±íµÄȨÏÞÊÚÓèÓû§u1ºÍu2¡£
2.°Ñɾ³ýStudent±í¡¢Course±íÖÐÊý¾ÝµÄȨÏÞÊÚÓèÓû§u1ºÍu2¡£
3.°ÑÐÞ¸ÄSC±íÖÐÑ¡¿Î¼Ç¼µÄȨÏÞÊÚÓèÓû§u1£¬²¢ÔÊÐíËûÔÙ½«´ËȨÁ¦ÊÚÓèÆäËûÓû§¡£ 4.°Ñ²éѯStudent±í¡¢SC±í¡¢Course±íµÄȨÁ¦ÊÚÓèÈ«ÌåÓû§¡£
5.°Ñ¶ÔStudent±íµÄËùÓвÙ×÷ȨÁ¦ÊÚÓèÓû§u1£¬u2£¬²¢ÔÊÐíËûÔÙ½«´ËȨÁ¦ÊÚÓèÆäËûÓû§¡£ 6.ÊÕ»ØÓû§u1¡¢u2¾ßÓеIJéѯStudent±íµÄȨÏÞ¡£
7.ÊÕ»Øu1¡¢u2ÓµÓеÄɾ³ýStudent±í¡¢Course±íÖÐÊý¾ÝµÄȨÏÞ¡£ 8.ÊÕ»ØÓû§u1¾ßÓеÄÐÞ¸ÄSC±íÖÐÑ¡¿Î¼Ç¼µÄȨÏÞ¡£
9.´ÓÈ«ÌåÓû§ÖÐÊջزéѯStudent±í¡¢SC±í¡¢Course±íµÄȨÁ¦¡£ 10.´ÓÓû§u1¡¢u2ÖÐÊջضÔStudent±íµÄËùÓвÙ×÷ȨÏÞ¡£
11.½¨Á¢Ò»¸öÖ»°üº¬È«Ìå¼ÆËã»úϵ£¨SC£©Ñ§ÉúѧºÅ¡¢ÐÕÃû¡¢ÐÔ±ðµÄÊÓͼ£»²¢½øÒ»²½°Ñ²éѯ¸ÃÊÓͼµÄȨÏÞ¸³¸øÓû§U1¡¢U2¡£ Èý¡¢¼ò´ðÌâ
1¡¢´æÈ¡¿ØÖÆ»úÖÆ°üÀ¨ÄÄÁ½²¿·Ö£¿ 2¡¢×ÔÖ÷´æÈ¡¿ØÖÆ 3¡¢Ç¿ÖÆ´æÈ¡¿ØÖÆ
µÚÎ岿·Ö Êý¾Ý¿âÍêÕûÐÔ Ö÷ÒªÄÚÈÝ£º
1¡¢ÈýÀàÍêÕûÐԵĶ¨Òå 2¡¢´¥·¢Æ÷µÄ×÷ÓÃ
Á·Ï°Ì⣺
Ò»¡¢Ñ¡ÔñÌâ
1. Èç¹ûÔÚѧÉú-¿Î³ÌÊý¾Ý¿âÖеÄSC±íÉϽ¨Á¢Á˲ÎÕÕÍêÕûÐÔÔ¼Êø£º Foreign Key £¨Sno£© References Student£¨Sno£©£¬ Foreign Key £¨Cno£©References Course£¨Cno£©£¬ Ôò£¨ £©²Ù×÷¿ÉÄÜ»áÎ¥±³¸ÃÔ¼Êø¡£
A£®ÔÚStudent±íÉÏÔö¼ÓÒ»ÐмǼ B£®ÔÚCourse±íÉÏÔö¼ÓÒ»ÐмǼ C£®ÔÚSC±íÉÏɾ³ýÒ»ÐмǼ D£®ÔÚSC±íÉÏÔö¼ÓÒ»ÐмǼ 2. Èç¹ûÔÚѧÉú-¿Î³ÌÊý¾Ý¿âÖеÄSC±íÉϽ¨Á¢Á˲ÎÕÕÍêÕûÐÔÔ¼Êø£º Foreign Key £¨Sno£© References Student£¨Sno£©£¬ Foreign Key £¨Cno£©References Course£¨Cno£©£¬ Ôò£¨ £©²Ù×÷¿ÉÄÜ»áÎ¥±³¸ÃÍêÕûÐÔÔ¼Êø¡£
A£®ÔÚStudent±íÉÏÔö¼ÓÒ»ÐмǼ B£®ÔÚCourse±íÉÏÔö¼ÓÒ»ÐмǼ C£®ÔÚSC±íÉÏɾ³ýÒ»ÐмǼ D£®¸üÐÂSC±íÉϵļǼ
3. Èç¹ûÔÚѧÉú-¿Î³ÌÊý¾Ý¿âÖеÄSC±íÉϽ¨Á¢Á˲ÎÕÕÍêÕûÐÔÔ¼Êø£º Foreign Key £¨Sno£© References Student£¨Sno£©£¬ Foreign Key £¨Cno£©References Course£¨Cno£©£¬ Ôò£¨ £©²Ù×÷²»¿ÉÄÜ»áÎ¥±³¸ÃÔ¼Êø¡£
A£®¸üÐÂSC±íÖеÄÑ¡¿Î¼Ç¼ B£®¸üÐÂCourse±íÖеĿγ̼Ǽ C£®ÔÚStudent±íÉÏÔö¼ÓÒ»¸öѧÉúµÄ¼Ç¼ D£®É¾³ýSC±íÖеÄÒ»ÌõÑ¡¿Î¼Ç¼ 4.ÏÂÃ棨 £©ÊôÓÚÊý¾Ý¿âÍêÕûÐÔ¿ØÖÆ¡£
A£®½ûֹδ¾ÊÚȨµÄÓû§µÇ¼Êý¾Ý¿â B£®¿ªÆôÉó¼Æ¹¦ÄÜ
C£®²»ÔÊÐíѧÉúµÄ¿¼ÊԳɼ¨Ð¡ÓÚ0·Ö D£®½«Êý¾Ý¿âÖеÄÊý¾Ý±¸·Ý 5.ÏÂÃ棨 £©Ò»¶¨²»ÊôÓÚÊý¾Ý¿âÍêÕûÐÔ¿ØÖÆ¡£ A£®ÔÚSC±íÉϽ¨Á¢Ò»¸ö´¥·¢Æ÷ B£®¸øÊý¾Ý±íµÄijһÁн¨Á¢Ò»¸öĬÈÏÖµ
C£®¹æ¶¨Student±íÖÐѧÉúµÄÐÔ±ðÖ»ÄÜÈ¡¡°ÄС±£¬¡°Å®¡± D£®½«Êý¾Ý¿âÖÐÒ׸ıäµÄÊý¾ÝºÍ²»Ò׸ıäµÄÊý¾Ý·Ö¿ª´æ·Å 6-10Ìâ Student¡¢SC¡¢Course±íÖÐÒÑÓÐÊý¾ÝÈçÏ£º Student£º Sno Sname Sdept Ssex Sage CS CS IS ÄÐ Å® ÄÐ 21 20 22 1234501 aaa 1234502 bbb 1234503 ccc
Course Cno Cname C01 Uuuu C02 Vvvv C10 Xxxx C11 Yyyy Cpno Ccredit C08 C07 C15 C16 1 2 2 3 1 C03 Wwww C06 C12 Zzzz SC Sno C20 4 Cno Grade 1234501 C01 80 1234501 C02 88 1234502 C01 90 1234503 C10 85 1234503 C11 91
7.ÈôÔÚSC±íÉϽ¨Á¢ÍâÂ룺
Foreign Key £¨Sno£© References Student£¨Sno£© ON Delete NO Action ON Update NO Action£¬
Foreign Key £¨Cno£©References Course£¨Cno£©ON Delete NO Action ON Update NO Action£¬
ÔòÏÂÃæÄܹ»Õý³£Ö´ÐеÄÑ¡ÏîÊÇ£¨ £©
A£®É¾³ýStudent±íÖÐѧºÅΪ1234501µÄ»ù±¾ÐÅÏ¢ B£®½«Course±íÖеĿγ̺ÅC01ÐÞ¸ÄΪC100 C£®ÔÚSC±íÉÏɾ³ýËùÓпγ̺ÅΪC01µÄÑ¡¿Î¼Ç¼
D£®ÔÚSC±íÉϲåÈëÒ»ÐÐÑ¡¿Î¼Ç¼£ºÑ§ºÅΪ1234502£¬¿Î³ÌºÅΪC02£¬³É¼¨80 8.ÈôÔÚSC±íÉϽ¨Á¢ÍâÂ룺
Foreign Key £¨Sno£© References Student£¨Sno£© ON Delete NO Action ON Update NO Action£¬
Foreign Key £¨Cno£©References Course£¨Cno£©ON Delete NO Action ON Update NO Action£¬
ÔòÏÂÃæÄܹ»Õý³£Ö´ÐеÄÑ¡ÏîÊÇ£¨ £©
A£®É¾³ýStudent±íÖÐѧºÅΪ1234501µÄ»ù±¾ÐÅÏ¢ B£®½«Course±íÖеĿγ̺ÅC01ÐÞ¸ÄΪC100
C£®ÐÞ¸ÄSC±íÉϵڶþÐÐÑ¡¿Î¼Ç¼£¬Ê¹µÃ¿Î³ÌºÅÓÉC02±äΪC20 D£®ÐÞ¸ÄSC±íÉϵÚÒ»ÐÐÑ¡¿Î¼Ç¼£¬Ê¹µÃ¿Î³ÌºÅC01±äΪC11 9. .ÈôÔÚSC±íÉϽ¨Á¢ÍâÂ룺
Foreign Key £¨Sno£© References Student£¨Sno£© ON Delete NO Action ON Update NO Action£¬
Foreign Key £¨Cno£©References Course£¨Cno£©ON Delete NO Action ON Update NO Action£¬
ÔòÏÂÃæ²»ÄÜÕý³£Ö´ÐеÄÑ¡ÏîÊÇ£¨ £©
A£®ÔÚStudent±íÖвåÈëÒ»¸öÐÂѧÉúµÄ»ù±¾ÐÅÏ¢£º
£¨Ñ§ºÅ1234510£¬ÐÕÃûddd£¬Ïµ±ðCS£¬ÐÔ±ðÅ®£¬ÄêÁä21£© B£®½«Course±íÖеĿγ̺ÅC12ÐÞ¸ÄΪC13 C£®É¾³ýSC±íÉϵڶþÐÐÑ¡¿Î¼Ç¼¡£
D£®½«Course±íÖеĿγ̺ÅC01ÐÞ¸ÄΪC15
10. ÈôÔÚSC±íÉϽ¨Á¢ÍâÂ룺
Foreign Key £¨Sno£© References Student£¨Sno£© ON Delete Cascade ON Update NO Action£¬
Foreign Key £¨Cno£©References Course£¨Cno£©ON Delete Cascade ON Update NO Action£¬ ÔòÏÂÃæÕýÈ·µÄ˵·¨ÊÇ£¨ £©
A£®ÔÚStudent±íÖÐɾ³ýÒ»¸öѧÉúµÄ»ù±¾ÐÅÏ¢£º
£¨Ñ§ºÅ1234501£¬ÐÕÃûaaa£¬Ïµ±ðCS£¬ÐÔ±ðÄУ¬ÄêÁä21£©£¬ÔòSC±íÖеÚÒ»ÐС¢µÚ¶þÐÐÑ¡¿Î¼Ç¼¾ù±»É¾³ý£»
B£®½«Course±íÖеĿγ̺ÅC12ÐÞ¸ÄΪC13 C£®É¾³ýSC±íÉϵڶþÐÐÑ¡¿Î¼Ç¼¡£
D£®½«Course±íÖеĿγ̺ÅC01ÐÞ¸ÄΪC15
µÚÁù²¿·Ö ¹ØϵÊý¾ÝÀíÂÛ¼°Êý¾Ý¿âÉè¼Æ Ö÷ÒªÄÚÈÝ£º
1¡¢Ò»¸ö²»ºÃµÄ¹Øϵģʽ¿ÉÄÜ´æÔÚµÄÎÊÌ⣻ 2¡¢º¯ÊýÒÀÀµ¼°ÈýÖÖº¯ÊýÒÀÀµµÄ¶¨Òå 3¡¢·¶Ê½¼°1NF/2NF/3NF/BCNFµÄÅж¨ 4¡¢Ä£Ê½·Ö½â
5¡¢Êý¾Ý¿âÉè¼ÆµÄ»ù±¾²½Öè 6¡¢¸ÅÄîÉè¼Æ£¨E-Rͼ£©
7¡¢Â߼ģÐÍ£¨E-Rͼת»»ÎªÂ߼ģÐ͵ķ½·¨£©
Á·Ï°Ì⣺
Ò»¡¢Ñ¡ÔñÌâ
1¡¢ Êý¾Ý¿âÐèÇó·ÖÎöʱ£¬Êý¾Ý×ÖµäµÄº¬ÒåÊǣߣߣ® A £®Êý¾Ý¿âÖÐËùÉæ¼°µÄÊôÐÔºÍÎļþµÄÃû³Æ¼¯ºÏ B £®Êý¾Ý¿âÖÐËùÉæ¼°µ½×Öĸ¡¢×Ö·û¼°ºº×ֵļ¯ºÏ C £®Êý¾Ý¿âÖÐËùÓÐÊý¾ÝµÄ¼¯ºÏ
D £®Êý¾Ý¿âÖÐËùÉæ¼°µÄÊý¾ÝÁ÷¡¢Êý¾ÝÏîºÍÎļþµÈÃèÊöµÄ¼¯ºÏ 2 ÏÂÁв»ÊôÓÚÐèÇó·ÖÎö½×¶Î¹¤×÷µÄÊǣߣߡ£ A £®·ÖÎöÓû§»î¶¯ B £®½¨Á¢E-Rͼ C £®½¨Á¢Êý¾Ý×Öµä D £®½¨Á¢Êý¾ÝÁ÷ͼ 3 Êý¾ÝÁ÷ͼÊÇÔÚÊý¾Ý¿â£ß£ß½×¶ÎÍê³ÉµÄ£® A £®Âß¼Éè¼Æ B £®ÎïÀíÉè¼Æ C £®ÐèÇó·ÖÎö D £®¸ÅÄîÉè¼Æ
5 ÔÚÊý¾Ý¿âÉè¼ÆÖУ¬ÓÃE-R ͼÀ´ÃèÊöÐÅÏ¢½á¹¹µ«²»Éæ¼°ÐÅÏ¢ÔÚ¼ÆËã»úÖеıíʾ£¬ËüÊôÓÚÊý¾Ý¿â Éè¼ÆµÄ½×¶Î¡£ A £®ÐèÇó·ÖÎö B £®¸ÅÄîÉè¼Æ C £®Âß¼Éè¼Æ D £®ÎïÀíÉè¼Æ