how to merge these two SQL queries?

Question

Schema: http://pastebin.com/jU3HmmNM

$mainfetch = "SELECT * FROM status ORDER BY status_id DESC LIMIT 10,0";

while($mainfetch -> $result) {
  $subquery = SELECT COUNT(*) FROM status s, likes l WHERE s.status_id = l.status_id AND l.member_id = 1;
$liked = $query->row();
if($liked > 0) {
//liked
}else {
//not liked
}
}

So this is not optimal as $subquery will execute each time 10 times, I wish to add $subquery to $mainfetch, how can I join them two?

Answer 1

您只需要在s.status_id = l.status_id上添加左连接，然后您还将得到l.status_id ：如果为null，则成员1不喜欢它，否则当然可以。

Answer 2

Using the schema you provided:

SELECT s.status_id, s.text_id, count(l.status_id) as like_count
FROM status AS s LEFT JOIN likes AS l ON (s.status_id = l.status_id AND l.member_id = 1) 
group by s.status_id, s.text_id
ORDER BY status_id DESC
LIMIT 10,0