结合两个mysql组查询

Question

I'm making a web app to create tournaments and as i have learned PHP in the course of this project, so my skills aren't probably the best.

I have an identifier in my database day2_semifinal or day2_additional which basically identifies the type of semifinal.

So my first query is:

$numberquery = mysql_query("
SELECT *
FROM tourneyplayers
INNER JOIN results
    on (resultid=r_id)
INNER JOIN players
    ON (p_id=playerid)
INNER JOIN tourneys
    on (T_Id=tourneyid)
WHERE tourneyid='$tourneyid' and
      in_day2 = 1 and
      day2_semifinal IS NOT NULL
GROUP BY day2_semifinal
ORDER BY agegroupid",$connection);

This will get me all the semifinal groups, i'll iterate over them and query all the players in group:

$semigroup = $group['day2_semifinal'];
$playerQuery = mysql_query("
SELECT *
FROM tourneyplayers
INNER JOIN results
    on (r_id=resultid)
INNER JOIN players
    on (p_id=playerid)
WHERE tourneyid='$tourneyid' AND
      day2_semifinal = '$semigroup' and
      in_day2 = 1
 ORDER BY day2startplace",$connection);

Now after i've created tables and echoed all the data from player queries for day2_semifinal , i run another query:

$numberquery = mysql_query("SELECT * FROM tourneyplayers INNER JOIN results on (resultid=r_id) INNER JOIN players ON (p_id=playerid) WHERE tourneyid='$tourneyid' and in_day2 = 1 and day2_additional_nosemi IS NOT NULL AND day2_additional_nosemi <> 0 GROUP BY day2_additional_nosemi ORDER BY agegroupid",$connection);

Which is fairly similar to the first one, only thing different is day2_semifinal identifiers have changed to day2_additional . After that query, i'll again, iterate over the day2_additional_nosemi groups and query the players inside of them:

$additionalgroup = $group['day2_additional_nosemi'];
$playerQuery = mysql_query("SELECT * FROM tourneyplayers INNER JOIN results on (r_id=resultid) INNER JOIN players on (p_id=playerid) WHERE tourneyid='$tourneyid' AND day2_additional_nosemi = '$additionalgroup' and in_day2 = 1 ORDER BY day2startplace",$connection);

Now this works, but this creates an issue with ordering, since the first query orders them by agegroupid but only for players in day2_semifinal (and i'd like to have day2_additional players ordered together with day2_semifinal ). If i run another query the previous data has already been echoed and ordering is not right. How could i concatenate two $numberquery queries in order to select players after them as well?

Answer 1

I'm answering my own question as i figured out a way to do this. What i did, was removed ORDER BY from both queries and created a new query which concatenated the two with UNION :

SELECT * FROM (
SELECT *
FROM tourneyplayers as tp1
INNER JOIN results as r1
    on (tp1.resultid=r1.r_id)
INNER JOIN players as p1
    ON (p1.p_id=tp1.playerid)
WHERE tp1.tourneyid=96 and
      tp1.in_day2 = 1 and
      r1.day2_semifinal IS NOT NULL
GROUP BY r1.day2_semifinal
UNION ALL
SELECT * 
FROM tourneyplayers as tp2
INNER JOIN results as r2
 on (tp2.resultid=r2.r_id) 
INNER JOIN players as p2
 ON (p2.p_id=tp2.playerid) 
WHERE tp2.tourneyid=96 and 
 tp2.in_day2 = 1 and 
 r2.day2_additional_nosemi IS NOT NULL AND 
 r2.day2_additional_nosemi <> 0 
 GROUP BY r2.day2_additional_nosemi
) t ORDER BY t.agegroupid;