SELECT
	pa.id
	,pad.id
	,pa.avalaible_gen
	,pad.avalaible_gen
	,pa.price_torg
	,pad.price_torg
	,(pa.price_torg - pad.price_torg) AS 'price_diff'
FROM `prices_all` pa
LEFT JOIN `prices_all_duplicate_21_12_18_2` pad ON pa.id = pad.id

WHERE 1=1
-- AND pa.avalaible_gen != pad.avalaible_gen
AND pa.price_torg != pad.price_torg
;