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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
尝试运行一些没有运气的SQL,尝试从两个满足条件的表中选择数据。
这些表是driver_details和位置。 这两个表都有一列user_id,我想根据两者之间匹配的user_id从两个表中获取数据。 (该select语句起作用并返回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))
我收到错误消息:致命错误:在第33行的C:\\ xampp \\ htdocs \\ vector \\ www \\ scripts \\ getDriversInRange.php中的非对象上调用成员函数bind_param()
您需要使用两个表中常见的某种东西来关联要联接的两个表,这用于连接它们...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
这基本上是BWS发布内容的更完整示例。
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