如何从单个子查询中获取2列值

Question

Here is my query: I want to get the user values which is stored in user table and comments which is stored in comments table.
The user_id is the id of the user which i fetch from comments table.
How to get both comments with respective users how to do that with single query or there is any good and best way to do that?

mysql_query("select profile_pic,firstname,lastname,username,comment from user join  comments where user_no IN (select user_id,comment from comments where   question_id='".$_POST['get_comments']."') ");

Answer 1

Try

SELECT profile_pic,firstname,lastname,username,comment 
FROM `user`
INNER JOIN comments ON `user`.user_no = comments.user_id
WHERE comments.question_id='".$_POST['get_comments']."'

Answer 2

i think the join condition you didn't specify and also you didn't specify what type of join you required try this code.

mysql_query("select profile_pic,firstname,lastname,username,comment from user left join  comments on user.columnname=comments.columnname where user_no IN (select user_id,comment from comments where   question_id='".$_POST['get_comments']."') ");

The column name specifies on which column you want to join to tables.for reference please read this