假设下表中属性 emp_dept 是 employee 表中的一个外码,其中 department 表是主表,ID 为主码,employee 表为从表。请指出下面给出的各行中哪一行不能插入 employee 表。( )。
DEPARTMENT:
1 ID NAME LOCATION
2 10 Accounting New york
3 40 Sales miami
EMPLOYEE:
1 EMP_ID EMP_NAME EMP_MGR TITLE EMP_DEPT
2 1234 Green President 40
3 4567 Gilmore 1234 Senior VP 40
4 1045 Rose 4567 Director 10
5 9876 Smith 1045 Accountant 10
9213 jones 1045 clerk 30
8997 grace 1234 secretary 40
5932 allen 4567 clerk null
3334 kkl 9867 liker 10