update urunler
set obrk2=replace(obrk2,ASCII_CHAR(13)||ASCII_CHAR(10)||ASCII_CHAR(13)||ASCII_CHAR(10),ASCII_CHAR(13)||ASCII_CHAR(10))
where ubarkod='078257584468'
and obrk2 like '%' ||ASCII_CHAR(13)||ASCII_CHAR(10)||'%';