关于错误参数PDO的MySQL和PHP

Question

I have problem with my code I don't know why.

My code:

$al2ss = $pdo->query("SELECT * FROM urun WHERE urunID = '".$urnListele['urunID']."' AND kategoriKod = '".$urnListele['kategoriKod']."' < 1 order by urunID DESC limit 1");
$al2sss = $al2ss->fetch(PDO::FETCH_LAZY);

Answer 1

When you tell database

kategoriKod = '".$urnListele['kategoriKod']."' < 1 

It's something like say, in words, select where this = that and that = 0 so that doesn't exist. This doesn't have so much sense, maybe you are looking for that if it doesn' exist so why don't you just go straight there?

kategoriKod != '".$urnListele['kategoriKod']."'

If you use != it will be like comparing your actual value stored in variable against database and select where it doesn't exist