WHERE clause

Using WHERE clause you can get the records based on a condition.

Syntax

SELECT column1, column2, … columnN FROM table_name WHERE [condition]

1. Select employee details, where name is krishna.

mysql> select * from employee WHERE firstName="Krishna";
+----+-----------+----------+--------+---------------------+
| id | firstName | lastName | salary | mailId              |
+----+-----------+----------+--------+---------------------+
|  1 | Krishna   | Ananda   | 100000 | krishna@krishna.com |
+----+-----------+----------+--------+---------------------+
1 row in set (0.07 sec)

2. Select employee details, where salary is greater than 10000.

mysql> select * from employee WHERE salary > 10000;
+----+-----------+-----------+--------+---------------------+
| id | firstName | lastName  | salary | mailId              |
+----+-----------+-----------+--------+---------------------+
|  1 | Krishna   | Ananda    | 100000 | krishna@krishna.com |
|  2 | Arjun     | Dhanunjay |  50000 | arjun@arjun.com     |
|  3 | Ptr       | Ptr       |  25000 | ptr@ptr.com         |
+----+-----------+-----------+--------+---------------------+
3 rows in set (0.00 sec)

3. Select employee details, where salary is 25000 and firstName is Ptr.

mysql> select * from employee WHERE (salary = 25000 AND firstName="Ptr");
+----+-----------+----------+--------+-------------+
| id | firstName | lastName | salary | mailId      |
+----+-----------+----------+--------+-------------+
|  3 | Ptr       | Ptr      |  25000 | ptr@ptr.com |
+----+-----------+----------+--------+-------------+
1 row in set (0.00 sec)

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