Adding a FOREIGN KEY to the Employees Table : Foreign Key « Constraints « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Constraints » Foreign Key 
7. 3. 5. Adding a FOREIGN KEY to the Employees Table
6CREATE TABLE Employees
7(empid int NOT NULL primary key,
8>  mgrid int NULL,
9>  empname varchar(25NOT NULL,
10>  salary money NOT NULL);
11> GO
1>
2INSERT INTO employees(empid, mgrid, empname, salaryVALUES1, NULL, 'Nancy',  $10000.00)
3INSERT INTO employees(empid, mgrid, empname, salaryVALUES2,    1'Andrew',  $5000.00)
4INSERT INTO employees(empid, mgrid, empname, salaryVALUES3,    1'Janet',   $5000.00)
5INSERT INTO employees(empid, mgrid, empname, salaryVALUES4,    1'Margaret',$5000.00)
6INSERT INTO employees(empid, mgrid, empname, salaryVALUES5,    2'Steven',  $2500.00)
7> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(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> drop table Employees;
3> GO
1>
2>
3>
7. 3. Foreign Key
7. 3. 1. The FOREIGN KEY Clause
7. 3. 2. FOREIGN KEY Constraints
7. 3. 3. A statement that adds a foreign key constraint
7. 3. 4. ON DELETE and ON UPDATE Options
7. 3. 5. Adding a FOREIGN KEY to the Employees Table
7. 3. 6. Re-creating the FOREIGN KEY with NO ACTION (Implicitly)
7. 3. 7. Referential Constraints
7. 3. 8. Cascading Updates and Deletes
7. 3. 9. Supporting Basic Referential Integrity with Foreign Keys
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