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[单选] 评估此CREATE TABLE语句的执行结果: CREATE TABLE part( part_id NUMBER, part_name VARCHAR2(), manufacturer_id NUMBER(), retail_price NUMBER(7,2)NOT NULL, CONSTRAINT part_id_pk PRIMARY KEY(part_id), CONSTRAINT cost_nn NOT NULL(cost), CONSTRAINT FOREIGN KEY (manufacturer_id)REFERENCES manufacturer(id)); 哪一行会导致产生错误()
A.6 B.7 C.8 D.9
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