IFNULL(IF(a.img IS NOT NULL, a.img, a.shbz_img), '') AS icon
IFNULL(IF(a.shbz_img IS NOT NULL, a.shbz_img, a.img), '') AS icon
FROM
wl_equipment_specific wes
LEFT JOIN (SELECT id, `code`, `name`, img, shbz_img, unit_id FROM wl_equipment WHERE LEFT(`code`, 1) IN (1, 3, 4, 5, 6, 7, 8)) a ON a.`code` = wes.equipment_code