mysql左連接複雜正確寫法

左連接where-----------------


	SELECT
				e1.real_exchange_rmb,
				IFNULL(c.channel, 1) AS promote_channel
			FROM
				(
					SELECT
						e.real_exchange_rmb,
						e.rid,
						IFNULL(r.regist_channel, 1) AS promote_channel
					FROM
						game_apply_exchange_order AS e
					LEFT JOIN game_registin AS r ON e.rid = r.user_id
					WHERE
						e.apply_time >= DATE_FORMAT(
							DATE_SUB(CURDATE(), INTERVAL 1 DAY),
							'%Y-%m-%d %H:%i:00'
						)
					AND e.apply_time < DATE_FORMAT(
						DATE_SUB(CURDATE(), INTERVAL 0 DAY),
						'%Y-%m-%d %H:%i:00'
					)
					AND e.manual_op_state IN (1, 6)
				) AS e1
			LEFT JOIN web_count AS c ON e1.promote_channel = c.channel
			WHERE
				c.compute_time = DATE_SUB(CURDATE(), INTERVAL 1 DAY)
	-------------------------------------下面的纔是對的----------			

SELECT
				e1.real_exchange_rmb,
				IFNULL(c.channel, 1) AS promote_channel
			FROM
				(
					SELECT
						e.real_exchange_rmb,
						e.rid,
						IFNULL(r.regist_channel, 1) AS promote_channel
					FROM
						game_apply_exchange_order AS e
					LEFT JOIN game_registin AS r ON e.rid = r.user_id
					WHERE
						e.apply_time >= DATE_FORMAT(
							DATE_SUB(CURDATE(), INTERVAL 1 DAY),
							'%Y-%m-%d %H:%i:00'
						)
					AND e.apply_time < DATE_FORMAT(
						DATE_SUB(CURDATE(), INTERVAL 0 DAY),
						'%Y-%m-%d %H:%i:00'
					)
					AND e.manual_op_state IN (1, 6)
				) AS e1
			LEFT JOIN (
				SELECT
					channel
				FROM
					web_count
				WHERE
					compute_time = DATE_SUB(CURDATE(), INTERVAL 1 DAY)
			) AS c ON e1.promote_channel = c.channel