How to do this query in MySQL which one should I use using left join or right join or inner join?

如何查询在MySQL中应该使用哪一种使用LEFTJOIN或右连接或内加入吗？

youdao

How to do this query in MySQL which one should I use using left join or right join or inner join?

如何查询在MySQL中应该使用哪一种使用LEFTJOIN或右连接或内加入吗？

youdao