mysql - 这个 SQL 语法有什么错误？

Question

我创建了这个 SQL 语句：

SELECT * 
    FROM forum_question 
        LEFT JOIN forum_answer ON (
            forum_question.id = forum_answer.question_id) 
    ORDER BY a_datetime DESC GROUP BY forum_question.id;

有谁知道这个问题？forum_question 和 forum_answer 以及 'id' 列由 by 存在。

Answer 1

GROUP BY子句应该在ORDER BY子句之前。换个试试看

GROUP BY forum_question.id
ORDER BY a_datetime DESC