Mysql计数区域之间的转移

Question

我有一张有许多不同“旅行”的大桌子，我有字段

trip_id (number)
fleet_id (number between 1 and 4)
start zone (number between 1 and 999)
end zone (number between 1 and 999)

我想计算从区域1到区域1，区域1到区域2 ...区域2到区域1，区域2到区域2 ...区域50到区域1等等的多少次旅行。 开始和结束区域也可以为空。

Answer 1

我认为你需要这样的东西

SELECT
    COUNT( trip_id ) AS `count`,
    start_zone, end_zone
FROM
    trips
WHERE 1
    AND start_zone > 0
    AND end_zone > 0
GROUP BY
    start_zone, end_zone