php - 使用连接从多个表中选择列

Question

我有两个表:-

用户(用户名、business_id 等)

商家(business_id、service_type、纬度、经度等)

我有以下查询，效果很好:

SELECT username, users.business_id FROM users JOIN businesses 
ON users.business_id = businesses.business_id WHERE service_type = ?

现在，我还想在结果中包含“businesses”表中的“latitude”和“longitude”列。我该怎么做？

我尝试执行以下操作，但出现错误:

SELECT username, users.business_id, businesses.latitude, businesses.longitude 
FROM users, businesses JOIN businesses 
ON users.business_id = businesses.business_id WHERE service_type = ?

获得所需结果的正确方法是什么？

Answer 1

您在 where 部分有两次业务:

FROM users, businesses JOIN businesses

去掉第一个，应该和之前一样:

FROM users JOIN businesses