SQL Where Clause
In this tutorial, we will learn about where clause.
The WHERE statement limits the rows retrieved to those meeting the search condition.
SELECT column_name(s)
FROM table_name
WHERE column_name operator_value
| ID | Category | Author | Tutorial |
| 1 | PHP | Hassan | what is php |
| 2 | MySql | James | what is sql |
| 3 | Ajax | Andrew | what is ajax |
| 4 | ASP | James | ASP Introduction |
| 5 | C++ | Andrew | C++ Basics |
Now we want to only records of an author whose name is jamaes, t.
select * from tutorials where author='James'
you will retrieve following result.
| ID | Category | Author | Tutorial |
| 2 | MySql | James | what is sql |
| 4 | ASP | James | ASP Introduction |
Tip:Numerice values always used without quotes
Correct: Select * from tutorials where id=5;
In Correct: Select * from tutorials where id='5';
In Correct: Select * from tutorials where id='5';
Tip: text values always used with quotes
Correct: Select * from tutorials where author='James';
In Correct: Select * from tutorials where id=James;
In Correct: Select * from tutorials where id=James;
| Operator | Description |
| = | Equal Example:Select * from tutorials where author='James';
It will show only records related author james |
| <> | Not equal Select * from tutorials where author <> 'James'; It will show only records that is not related to author james |
| > | Greater than Select * from tutorials where id>2 ; It will show only records whose are greater than 2 |
| < | Less than Select * from tutorials where id<3 ; It will show only records whose are less than 3 |
| >= | Greater than or equal Select * from tutorials where id>=3 ; It will show only records whose id is greater than or equal to 3 |
| <= | Less than or equal Select * from tutorials where id<=3 ; It will show only records whose id is less than or equal to 3 |
| BETWEEN | Between an inclusive range Select * from tutorials
WHERE date BETWEEN 'Jan-06-1999' AND 'Jan-10-1999' It will show only records between Jan-06-1999 to Jan-10-1999 |
| LIKE | Search for a pattern SELECT *
FROM tutorial
WHERE author LIKE '%an%' It will show only records whose whose name contains 'an' |
| IN | If you know the exact value you want to return for at least one of the columns SELECT *
FROM tutorials WHERE author IN ('Andrew', 'Hassan') It will show only records whose author name contains Andrew, Hassan |