你customer表的第三条和第四条数据违反cruise_cd的唯一性:cruise_cd integer unique,insert into customer values(cus_seq.nextval,'Dirk Stringer','Washington','5479982','[email protected]',3,'9/6/01',5);
insert into customer values(cus_seq.nextval,'Ann Dull','Florida','6754387','[email protected]',3,'9/6/01',2);
insert into customer values(cus_seq.nextval,'Ann Dull','Florida','6754387','[email protected]',3,'9/6/01',2);
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