Wednesday, September 28, 2011

SQL AND & OR Operators

The AND & OR operators are used to filter records based on more than one condition.




The AND & OR Operators

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.



AND Operator Example

The "Persons" table:


P_Id LastName FirstName Address City
1 Hansen Ola Timoteivn 10 Sandnes
2 Svendson Tove Borgvn 23 Sandnes
3 Pettersen Kari Storgt 20 Stavanger

Now we want to select only the persons with the first name equal to "Tove" AND the last name equal to "Svendson":

We use the following SELECT statement:


SELECT * FROM Persons

WHERE FirstName='Tove'

AND LastName='Svendson'

The result-set will look like this:


P_Id LastName FirstName Address City
2 Svendson Tove Borgvn 23 Sandnes




OR Operator Example

Now we want to select only the persons with the first name equal to "Tove" OR the first name equal to "Ola":

We use the following SELECT statement:


SELECT * FROM Persons


WHERE FirstName='Tove'

OR FirstName='Ola'

The result-set will look like this:

P_Id LastName FirstName Address City
1 Hansen Ola Timoteivn 10 Sandnes
2 Svendson Tove Borgvn 23 Sandnes




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 last name equal to "Svendson"
AND the first name equal to "Tove" OR to "Ola":

We use the following SELECT statement:


SELECT * FROM Persons WHERE

LastName='Svendson'

AND (FirstName='Tove' OR FirstName='Ola')

The result-set will look like this:


P_Id LastName FirstName Address City
2 Svendson Tove Borgvn 23 Sandnes


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