sql sentence

Dear Experts,

I need to add where clause to below sql statement. I use PHP and mysql

I'd like to add WHERE a.onay='1' to the sql statement  (  onay coloumn is on the first table )

where should I add it? I added it before LIMIT clause, but it didn't work.

$sql9 = "SELECT a.id, a.sehir, a.uid, a.baslik, a.kategori, a.fiyat, a.icerik, a.telefon, a.sontarih, a.onay ,b.ilanid ,b.resim
FROM ilan a  
LEFT JOIN
(
    SELECT ilanid, MAX(resim) resim
    FROM resimler
    GROUP BY ilanid
	DESC
)b ON a.id = b.ilanid LIMIT $start_from, $per_page";

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