MySQL WHERE Clause
MySQL WHERE Clause is used with SELECT, INSERT, UPDATE and DELETE clause to filter the results. It specifies a specific position where you have to do the operation.
Syntax:
WHERE conditions;
Parameter:
conditions: It specifies the conditions that must be fulfilled for records to be selected.
MySQL WHERE Clause with single condition
Let’s take an example to retrieve data from a table “officers”.
Table structure:
Execute this query:
SELECT *
FROM officers
WHERE address = ‘Mau’;
Output:
MySQL WHERE Clause with AND condition
In this example, we are retrieving data from the table “officers” with AND condition.
Execute the following query:
SELECT *
FROM officers
WHERE address = ‘Lucknow’
AND officer_id < 5;
Output:
WHERE Clause with OR condition
Execute the following query:
SELECT *
FROM officers
WHERE address = ‘Lucknow’
OR address = ‘Mau’;
Output:
MySQL WHERE Clause with combination of AND & OR conditions
You can also use the AND & OR conditions altogether with the WHERE clause.
See this example:
Execute the following query:
SELECT *
FROM officers
WHERE (address = ‘Mau’ AND officer_name = ‘Ajeet’)
OR (officer_id < 5);
Output:
