Question

I want to select all rows where WHERE (uid = {$uid} OR uid = **HERE** ) where **HERE** is the cids retreived from query 2 below.

Query 1:

    SELECT * FROM `t_activities`
    WHERE (`uid` = {$uid} OR `uid` = **HERE** )
    AND `del` = 0
    GROUP BY `fid`
    ORDER BY `time` DESC 
    LIMIT 10

And Query 2:

SELECT `cid` FROM `t_con` WHERE `uid` = {$uid} AND `flag` = 1

Answer 1

SELECT * FROM `t_activities`
WHERE (`uid` = {$uid} OR `uid` in (SELECT `cid` 
                                   FROM `t_con` 
                                   WHERE `uid` = {$uid} AND `flag` = 1))
AND `del` = 0
GROUP BY `fid`
ORDER BY `time` DESC 
LIMIT 10