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[英]Updating a field and selecting multiple fields where a single condition is true? MySQL
[英]selecting from multiple tables where a condition is true
嘗試運行一些沒有運氣的SQL,嘗試從兩個滿足條件的表中選擇數據。
這些表是driver_details和位置。 這兩個表都有一列user_id,我想根據兩者之間匹配的user_id從兩個表中獲取數據。 (該select語句起作用並返回ID);
SELECT driver_details.firstName,
locations.lat,
locations.lng
FROM driver_details
INNER JOIN locations
WHERE user_id =
(SELECT user_id FROM locations WHERE
(lat BETWEEN 0 AND 5) AND
(lng BETWEEN 0 AND 5))
我收到錯誤消息:致命錯誤:在第33行的C:\\ xampp \\ htdocs \\ vector \\ www \\ scripts \\ getDriversInRange.php中的非對象上調用成員函數bind_param()
您需要使用兩個表中常見的某種東西來關聯要聯接的兩個表,這用於連接它們...您提到了user_id
...
FROM driver_details
INNER JOIN locations
ON driver_details.user_id = locations.user_id
WHERE ...
SELECT d.firstName,
l.lat,
l.lng
FROM driver_details d
INNER JOIN locations l ON d.user_id = l.user_id
WHERE l.lat BETWEEN 0 AND 5
AND l.lng BETWEEN 0 AND 5
這基本上是BWS發布內容的更完整示例。
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