SQL AND & OR

The AND operator displays a record if both the first condition and the second condition is true.
 The OR operator displays a record if either the first condition or the second condition is true.

The syntax for a compound condition is as follows: 
SELECT "column_name"
FROM "table_name"
WHERE "simple condition"
{[AND|OR] "simple condition"}+ 

The "custmast" Table:

custcode	custname	city	qty	rate
1	Siva	Srivilliputtur	50	70
2	Bala	Sivakasi	30	56
3	Kanna	Madurai	100	200
4	Vijay	Chennai	30	30
5	Kodee	Srivilliputtur	60	30
5	Kodee	Srivilliputtur	60	30

                                                                  AND
Ex:1

Select  *   from Custmast  WHERE custname='Siva' AND city='Srivilliputtur'

Output :

custcode	custname	city	qty	rate
1	Siva	Srivilliputtur	50	70

Ex:2

Select * From Custmast WHERE custname='Siva' AND City='Sivakasi'

Output :

     No Records

                                                                                 OR

The Above Example to OR condition

SELECT * FROM custmast WHERE custname='Siva' OR City='Sivakasi'

Output :

custcode	custname	city	qty	rate
1	Siva	Srivilliputtur	50	70
2	Bala	Sivakasi	30	56

                                                  Combining AND & OR

You can also combine AND and OR (use parenthesis to form complex expressions).
Now we want to select only the persons with the custname equal to "Siva" AND the City equal to "Srivilliputtur" OR to "Chennai": 

We use the following SELECT statement

SELECT * FROM custmast WHERE custname='Siva' 
AND (City='Srivilliputtur' OR City='Chennai')

Output :

custcode	custname	city	qty	rate
1	Siva	Srivilliputtur	50	70