SQL查詢2個不同的表

Question

我有桌子：

1. 行程：Trip_Num，Trip_Type等。
2. 用戶的行程歷史記錄：用戶名，Trip_Num等

我正在用php做一個項目，需要針對特定​​用戶（通過其用戶名）執行SQL查詢-需要在“用戶的旅行歷史記錄”表中了解Trip_Num的Trip_Type。

附上我有的表：

旅行

用戶的旅行記錄

更新：我需要依靠Trip_type中的每個值。 我的意思是我想看“徒步”-4次，“自行車”-3次，這很好嗎？ .................................................. select選擇Trips_History。*，Trips.Trip_Type，COUNT（Trip_Type）AS Trip_Type_occurrence來自行程歷史記錄INNER JOIN Trips_History.Trip_Num = Trips.Trip_Num GROUP BY Trip_Type ORDER BY Trip_Type_occurrence DESC –

Answer 1

一個簡單的JOIN可以做到：

SELECT
    th.*,
    t.Trip_Type
FROM Trip_History AS th
INNER JOIN Trips AS t
    ON t.Trip_Num = th.Trip_Num

Answer 2

嘗試這個：

 select Trips_History.*,COUNT(Trips.Trip_Type) AS Trip_Type_occurrence FROM Trips_History INNER JOIN Trips on Trips_History.Trip_Num = Trips.Trip_Num  GROUP BY Trip_Type ORDER BY Trip_Type_occurrence DESC

Answer 3

嘗試這個

select t2.traveller_username,t1.Trip_Type from 
trips as t1 inner join trips_history as t2 on t1.Trip_num=t2.trip_num

Answer 4

嘗試，

SELECT t.Trip_Type, u.Trip_Num from trips at t 
JOIN user_trips_history ON u.Trip_Num = t.Trip_Num 
WHERE u.Traveller_Username = 'username';

Answer 5

嘗試做：

SELECT t.Trip_Type, u.Trip_Num FROM trips as t 
JOIN user_trips_history as u ON t.Trip_Num=u.Trip_Num 
WHERE u.Traveller_Username = 'USERNAME';

Answer 6

你可以試試這個-

SELECT users_trip_history.trip_num, trips.trip_type, COUNT(trips.trip_type) AS trip_occurences
FROM users_trip_history
INNER JOIN trips
ON users_trip_history.trip_num = trips.trip_num 
WHERE users_trip_history.traveler_username = "name"
GRUOP BY trip_num;