I am trying to run the following query, and I keep getting a syntax error. The query works fine without the LEFT JOIN. How can I implement the LEFT JOIN without error?
SELECT
m.mid,
m.seq,
m.created_on,
m.created_by,
m.body,
r.status,
u.username_clean
FROM message_recipient r
INNER JOIN message m
ON m.mid = r.mid AND m.seq = r.seq
WHERE r.uid = ".$logged_in_id."
AND r.status in ('A', 'N')
AND r.seq = (
SELECT
MAX(rr.seq)
FROM message_recipient rr
WHERE rr.mid = m.mid
AND rr.status in ('A', 'N')
)
AND IF (m.seq=1 and m.created_by = ".$logged_in_id." , 1=0, 1=1)
ORDER BY created_on DESC
LEFT JOIN users u
ON u.user_id = m.created_by
The LEFT JOIN
is in the wrong place. All of the JOINs need to be before the WHERE
clause:
SELECT
m.mid,
m.seq,
m.created_on,
m.created_by,
m.body,
r.status,
u.username_clean
FROM message_recipient r
INNER JOIN message m
ON m.mid = r.mid AND m.seq = r.seq
LEFT JOIN users u
ON u.user_id = m.created_by
WHERE r.uid = ".$logged_in_id."
AND r.status in ('A', 'N')
AND r.seq = (
SELECT
MAX(rr.seq)
FROM message_recipient rr
WHERE rr.mid = m.mid
AND rr.status in ('A', 'N')
)
AND IF (m.seq=1 and m.created_by = ".$logged_in_id." , 1=0, 1=1)
ORDER BY created_on DESC
The SQL clauses go in the following order:
SELECT
FROM
JOIN
WHERE
GROUP BY
ORDER BY
Even if you have multiple joins they will all appear before the WHERE
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.