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IF = ÄÚǶ±íº¯Êý
K = PRIMARY KEY »ò UNIQUE Ô¼Êø
L = ÈÕÖ¾
P = ´æ´¢¹ý³Ì
R = ¹æÔò
RF = ¸´ÖÆÉ¸Ñ¡´æ´¢¹ý³Ì
S = ϵͳ±í
TF = ±íº¯Êý
TR = ´¥·¢Æ÷
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