mysql fetch data in where condition - php

Question

I have 3 table now:
First is : member_username
+-------------+------------------+
| uid | username |
+-------------+------------------+
| 1 | theone |
| 2 | ohno |
| 3 | prayforpr |
+-------------+------------------+
Second is : member_data
+-------------+-------------------+-----------------+
| uid | talk | etc |
+-------------+-------------------+-----------------+
| 1 | talk1 | |
| 2 | talkeee | |
| 3 | iojdfnl | |
+---------------------------------------------------+
Third is : member_level
+-------------+-------------------+-----------------+
| uid | level | fid |
+-------------+-------------------+-----------------+
| 1 | 2 | 1 |
| 1 | 10 | 2 |
| 2 | 1 | 1 |
| 2 | 99 | 2 |
| 1 | 40 | 3 |
| 3 | 50 | 1 |
| 1 | 44 | 4 |
+---------------------------------------------------+
I would like to query data and display the only one uid when member_level is higher in when SUM member_level.level Where fid in 1,2,3.
my query now is like below, but this query is sum all the level including fid 4 also, how to specify only sum in fid 1,2,3? and how do I assign the SUM of member_level.level Where fid in 1,2,3 to $levelKingTotalLevel?
$levelKing = DB::query("SELECT t1.uid,t1.username,t2.talk FROM ".DB::table('member_level')." t3 JOIN ".DB::table('member_username')." t1 ON(t3.uid = t1.uid) JOIN ".DB::table('member_data')." t2 ON (t1.uid = t2.uid) GROUP BY t3.uid ORDER BY SUM(t3.level) DESC LIMIT 1");
while($rowlevelKing = DB::fetch($levelKing)) {
$levelKingTotalLevel = $rowlevelKing['???'];
$levelKingN = $rowlevelKing['username'];
$levelKingUID = $rowlevelKing['uid'];
$levelKingT = $rowlevelKing['talk'];
};
echo "The ".$levelKingN." total level is ".$levelKingTotalLevel." and he talk about ".$levelKingT;
Thank you.

Answer 1

To filter records having fid values as 1, 2 or 3, use IN statement in WHERE clause. Alias totalLevel in select statement will give you total level for a user.
SELECT t1.uid, t1.username, t2.talk, SUM(t3.level) AS totalLevel
FROM member_level t3
JOIN member_username t1
ON (t3.uid = t1.uid)
JOIN member_data t2
ON (t1.uid = t2.uid)
WHERE t3.fid IN (1,2,3)
GROUP BY t3.uid
ORDER BY totalLevel DESC
LIMIT 1