SELECT *
FROM "CUSTOM_LABEL" "cl"
LEFT JOIN ( "CUSTOM_LABEL_BAK" "clb"
LEFT JOIN "DATA_SOURCE_INFO" "dsi" ON "clb"."CUSTOM_LABEL_VALUE" = "dsi"."REMARK"
) ON "cl"."ACCURACY_TYPE" = "clb"."CUSTOM_LABEL_NAME"
---------------------------
SELECT *
FROM "CUSTOM_LABEL" "cl"
	LEFT JOIN (
		"CUSTOM_LABEL_BAK" "clb"
		LEFT JOIN "DATA_SOURCE_INFO" "dsi" ON "clb"."CUSTOM_LABEL_VALUE" = "dsi"."REMARK"
	) ON "cl"."ACCURACY_TYPE" = "clb"."CUSTOM_LABEL_NAME"