Question

Ms Shalini has just created a table named “Employee” containing columns Ename, Department and Salary. After creating the table, she realized that she has forgotten to add a primary key column in the table. Help her in writing an SQL command to add a primary key column EmpId of integer type to the table Employee.

Thereafter, write the command to insert the following record in the table:

EmpId- 999
Ename- Shweta
Department: Production
Salary: 26900

Answer 1

SQL Command to add primary key:

ALTER TABLE Employee ADD EmpId INTEGER
PRIMARY KEY;

As the primary key is added as the last field, the command for inserting data will be:

INSERT INTO Employee
VALUES("Shweta","Production",26900,999);
OR
INSERT INTO
Employee(EmpId,Ename,Department,Salary)
VALUES(999,"Shweta","Production",26900);