mysql syntax error on inner join statement

Question

I want to get the 5 last rows from two tables.

Here is the mysql statement I execute:

"SELECT title, thread_id
FROM threads AS t1
JOIN ON comments AS c1 ON t1.user_id = c1.user_id
 WHERE t1.user_id=".$userID
." OR c1.user_id=".$userID.
" ORDER BY thread_id DESC
LIMIT 0,5"

Here is the mistake:

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ON comments AS c1 ON t1.user_id = c1.user_id WHERE t1.user_id=1 OR c1.' at line 3

What am I doing wrong?!?

Answer 1

你有多余的ON之前comments 。

Answer 2

There isnt anything like JOIN ON should be just JOIN or INNER JOIN , LEFT JOIN . something like this:

"SELECT title, thread_id
FROM threads AS t1
JOIN comments AS c1 ON t1.user_id = c1.user_id
 WHERE t1.user_id=".$userID
." OR c1.user_id=".$userID.
" ORDER BY thread_id DESC
LIMIT 0,5"

Answer 3

Remove the extra ON in 3rd line. It will works.

"SELECT title, thread_id
FROM threads AS t1
JOIN comments AS c1 ON t1.user_id = c1.user_id
 WHERE t1.user_id=".$userID
." OR c1.user_id=".$userID.
" ORDER BY thread_id DESC
LIMIT 0,5"