SELECT
	variant_detail.vad_variant_code AS sku,
	variant_stock_location.vsl_free_stock_quantity AS free_stock,
	(SELECT stock_location.sl_name
	FROM stock_location
	WHERE variant_stock_location.vsl_sl_id = stock_location.sl_id) AS stock_location
FROM
	variant_detail
	JOIN variant_stock_location ON variant_detail.vad_id = variant_stock_location.vsl_vad_id
WHERE
	variant_stock_location.vsl_sl_id = 1