Mysql 此SQL查询的更好/备选措辞方式

写出以下查询的更好/更有效的方法是什么

当前SQL查询的工作做得很好，但我担心数据库变大时的处理时间

SELECT *
FROM room
JOIN catering ON room.room_id = catering.room_id
WHERE capacity BETWEEN '$minCapacity' AND '$maxCapacity' 
AND room.room_id NOT IN 
    (SELECT room_id
    FROM room_booking
    WHERE date_booked = '$us_date')
AND catering.grade = '$grade' ORDER BY room.capacity

---

您可以将

不在

中更改为

不存在

。如果有大量数据可以提高性能：

SELECT *
FROM room
JOIN catering ON room.room_id = catering.room_id
WHERE capacity BETWEEN '$minCapacity' AND '$maxCapacity' 
AND NOT EXISTS
(
    SELECT
        NULL
    FROM
        room_booking
    WHERE
        date_booked = '$us_date'
        AND room.room_id=room_booking.room_id
)
AND catering.grade = '$grade' 
ORDER BY room.capacity

---

您可以将

不在

中更改为

不存在

。如果有大量数据可以提高性能：

SELECT *
FROM room
JOIN catering ON room.room_id = catering.room_id
WHERE capacity BETWEEN '$minCapacity' AND '$maxCapacity' 
AND NOT EXISTS
(
    SELECT
        NULL
    FROM
        room_booking
    WHERE
        date_booked = '$us_date'
        AND room.room_id=room_booking.room_id
)
AND catering.grade = '$grade' 
ORDER BY room.capacity