MySQL 'user_id' in where 子句是不明确的问题
如何纠正我从下面的代码中不断得到的问题，其中声明了 where 子句中的 'user_id' 不明确.提前感谢您的帮助.
How can I correct the problem I keep getting from the code below which states 'user_id' in where clause is ambiguous. Thanks for the help in advance.
这是mysql表.
SELECT user.*, user_info.*
FROM user
INNER JOIN user_info ON user.user_id = user_info.user_id
WHERE user_id='$user_id'
推荐答案
您只需要指定使用哪个 user_id，因为 user_info 和 user 表有一个名为 user_id 的字段:
You simply need to specify which user_id to use, since both the user_info and user table have a field called user_id:
... WHERE user.user_id='$user_id'
SQL 不会容忍这种歧义，因为据它所知，这两个字段可以代表完全不同的数据.
SQL wouldn't tolerate this ambiguity, since for what it knows, both fields can represent totally different data.
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