1. SQL – Select query Waq to display the employees with no commission.
‘IS NULL ‘ Operator ID
NAME
SALARY
comm 1
ARUN
6000
500 2
VARUN
8000 3
ALI
9000
300 4
GEORGE
12000 5
MOHD
250
Waq to display the employees with no commission.
output
Select * from employee where comm is null; ID
NAME
SALARY
comm 2
VARUN
8000 4
GEORGE
12000

2. SQL – Select query Waq to display the employees with commission.
‘IS NOT NULL ‘ Operator ID
NAME
SALARY
comm 1
ARUN
6000
500 2
VARUN
8000 3
ALI
9000
300 4
GEORGE
12000 5
MOHD
250
Waq to display the employees with commission.
output ID
NAME
SALARY
comm 1
ARUN
6000
500 3
ALI
9000
300 5
MOHD
8000
250
Select * from employee where comm is not null;

3. SQL – Select query
employee
‘IN’ Operator ID
NAME
place 1
ARUN
Dubai 2
VARUN
Sharjah 3
ALI 4
GEORGE
Ajman 5
MOHD
Al ain
WAQ to display the details of employees from Dubai, Sharjah and Ajman.
output ID
NAME
place 1
ARUN
Dubai 2
VARUN
Sharjah 3
ALI 4
GEORGE
Ajman
Select * from employee where place IN (‘ dubai’, ’sharjah’,’ ajman’ );

4. SQL – Select query
employee
‘ NOT IN’ Operator ID
NAME
place 1
ARUN
Dubai 2
VARUN
Sharjah 3
ALI 4
GEORGE
Ajman 5
MOHD
Al ain
WAQ to display the details of employees not from Dubai, Sharjah and Ajman.
output ID
NAME
place 5
MOHD
Al ain
Select * from employee where place NOT IN (‘ dubai’, ’sharjah’,’ ajman’ );

5. Putting text in a query output
Select name, ’gets commission’ , comm from employee where comm is not null;
employee
output ID
NAME
SALARY
COMM 1
ARUN
6000
500 2
VARUN
8000 3
ALI
9000
300 4
GEORGE
12000 5
MOHD
250
NAME
GETSCOMMISSION
COMM
ARUN
gets commission
500
ALI
300
MOHD
250

6. Comparison between ‘having’ and ‘where’ clauses
Having clause
Where clause
‘Having’ clause sets conditions on groups
‘having’ conditions include aggregate functions
‘Where’ clause sets conditions on individual rows.
‘where’ conditions can not include aggregate functions