Which of the following query/command is most likely to produce an error starting with “ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails” when executed on a Linux server…
This question is from the subject, Database Systems
Which of the following query/command is most likely to produce an error starting with “ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails” when executed on a Linux server? Assume that the table Dept contains the tuples shown below and that the Emp and Proj tables are defined as in the lab sheet (although they may contain different tuples). +———– +————————+ | deptno deptname mgrno | admrdept +———– ——- ———- ————–+ A00 | Spiffy Computer Service DIV. | 000010 A00 | B01 | Planning 000020 A00 | 001 | Information Centre 000030 A00 DO1 Development Centre NULLA00 | D11 | Manufacturing Systems 000060 D01 D21 Administration Systems | 000070 D01 | E01 Support Services | 000050 A00 | E11 | Operations | 000090 | E01 E21 Software Support | 000100 E01 | ———— ————-+ +——– —— O SELECT deptname, mgrno FROM Dept WHERE mgrno NULL AND deptname LIKE ‘%S%’; O DELETE FROM Dept WHERE deptno = ‘A00″; DELETE FROM Dept WHERE deptno = ‘A01’; O INSERT INTO Emp (empno, firstname, lastname) VALUES (‘AN007’, ‘James’, ‘Bond’);
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