Avoiding inserting duplicate rows in mySQL

Question

I have a table with an auto_inc id (primary key). I am trying to avoid the insertion of duplicate rows.

Example of a duplicate row:

id           


        

Answer 1

You can use this also.

INSERT INTO `tableName` ( `field1`, `field2`,`field3`)
SELECT `field1`, `field2`,`field3` FROM `tableName`
WHERE NOT EXISTS (SELECT 1
    FROM `tableName`
    WHERE 
    `field1` = 'value' AND `field2` = 'value'  AND `field3` = 'value'
    );