Benim tablo 3 değerlerinin-oluşur

• uzun
• kısa
• kimlik

kimlik otomatik artış int değeri ve kalan metindir.

My PHP script retrieves the latest version of a program every half an hour and stores it as uzun in an sql table. What I want is for the php script to check if the value is already in the table(i.e. there are no new versions). If it isn't I want it to insert the new data. Just to make this clear I am not replacing the value "uzun". I am merely making a new value of it and 'kimlik' is keeping a record of how many versions there have been.