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 should use ON DUPLICATE KEY UPDATE and declaring the fields as unique .

If you specify ON DUPLICATE KEY UPDATE, and a row is inserted that would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row is performed.