SQL查询错误

Question

使用以下查询:

SELECT SeatPref FROM (SELECT SeatPref, COUNT(CustID) AS seat_count FROM Booking 
    GROUP BY SeatPref) WHERE seat_count = max(seat_count)

我收到以下错误:

每个派生表都必须有自己的别名.

Answer 1

你缺少表别名 -

SELECT t1.SeatPref 
FROM (SELECT SeatPref, COUNT(CustID) AS seat_count 
      FROM `Booking` 
      GROUP BY SeatPref)  t1
WHERE t1.seat_count = max(t1.seat_count)