MySQL內部連接查詢語法錯誤

Question

我是一個MySQL新手，無法弄清楚這裏出了什麼問題。我有兩張桌子。左表稱爲「鍛鍊」。相關列爲date（類型日期）和id（類型爲int）。

右表名爲Workout_locations（相關字段：workout_id type int, and location_id type int）。

連接字段是Workouts.id和Workout_locations.workout_id。

我想要做的是得到兩列的表：date（來自Workouts）和location_id（來自Workout_locations）。我只需要根據幾個字段從Workouts表中提取記錄（sql語句應該清楚這一點）。

這裏是我的SQL語法：

SELECT Workouts.date as date, Workout_locations.location_id as loc_id 
FROM Workouts 
WHERE Workouts.pacegroup_id='9' AND (Workouts.date BETWEEN '2013-08-19' AND '2013-08-25') 
INNER JOIN Workout_locations ON Workouts.id=Workout_locations.workout_id" 

但我得到這個錯誤：

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INNER JOIN Workout_locations ON Workouts.id=Workout_locations.workout_id' at line 1

我希望這是一個非常簡單的錯誤發現有人誰是經歷了這。任何人都可以看到它？謝謝！

Answer 1

您的INNER JOIN應該在WHERE之前。我也並不認爲你所需要的括號around your BETWEEN clause，但我懷疑這會導致錯誤的兩種方式：

SELECT Workouts.date as date, Workout_locations.location_id as loc_id 
FROM Workouts 
INNER JOIN Workout_locations ON Workouts.id=Workout_locations.workout_id 
WHERE Workouts.pacegroup_id = '9' 
AND Workouts.date BETWEEN '2013-08-19' AND '2013-08-25'; 

而且，儘管他們技術上讓你擺脫它，你應該避免使用「日期」作爲選定的列名稱（這是一個reserved word）。

你可以做一些簡化，以及以使事情更容易閱讀的：

SELECT Workouts.date AS wo_date, Workout_locations.location_id AS loc_id 
FROM Workouts w 
INNER JOIN Workout_locations l ON w.id = l.workout_id 
WHERE w.pacegroup_id = '9' 
AND w.date BETWEEN '2013-08-19' AND '2013-08-25';