SQL查詢2頁不同的表

Question

我有表：

1. 旅行：Trip_Num，Trip_Type等
2. 用戶的旅行史：用戶名，Trip_Num等

我做了項目在PHP中，需要爲特定用戶（通過他的用戶名）做一個SQL查詢 - 需要知道用戶的旅程歷史表中的Trip_Num的Trip_Type。

附我有表：

旅行

用戶的旅行史

更新： 我需要對Trip_type中的每個值進行計數。我的意思是我想看到「徒步」 - 4次出現，「自行車」 - 3次出現，這很好嗎？......................... ..................................................選擇Trips_History *，Trips.Trip_Type，COUNT（Trip_Type）AS Trip_Type_occurrence TRIPS協定歷史INNER JOIN BY Trip_Type量級Trips_History.Trip_Num = Trips.Trip_Num團體旅行BY Trip_Type_occurrence DESC -

Answer 1

一個簡單JOIN會做。

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

Answer 2

試試這個：

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

試試這個

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

嘗試這樣做：

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;