6> CREATE TABLE Employees
7> (empid int NOT NULL primary key,
8> mgrid int NULL,
9> empname varchar(25) NOT NULL,
10> salary money NOT NULL);
11> GO
1>
2> INSERT INTO employees(empid, mgrid, empname, salary) VALUES( 1, NULL, 'Nancy', $10000.00)
3> INSERT INTO employees(empid, mgrid, empname, salary) VALUES( 2, 1, 'Andrew', $5000.00)
4> INSERT INTO employees(empid, mgrid, empname, salary) VALUES( 3, 1, 'Janet', $5000.00)
5> INSERT INTO employees(empid, mgrid, empname, salary) VALUES( 4, 1, 'Margaret',$5000.00)
6> INSERT INTO employees(empid, mgrid, empname, salary) VALUES( 5, 2, 'Steven', $2500.00)
7> GO
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
1>
2>
3> ALTER TABLE Employees ADD CONSTRAINT FK_Employees_Employees
4> FOREIGN KEY(mgrid)
5> REFERENCES Employees(empid)
6> GO
1>
2>
3> ALTER TABLE Employees DROP CONSTRAINT FK_Employees_Employees
4> GO
1> drop table Employees;
2> GO
1>