select from two records in mysql

[gerkintrigg]

Hi.
I have a database with two tables... a member one and a vote one. I want to select the member's name from the member database where that member voted for me and I voted for the member.

I can work out both halves of it, but can't work out how to put them both together.

the current code i have is this:

[code]$dbl_pokes_sql=mysql_query("Select member.fname, member.description, pokes.poker, pictures.url from pokes, member, pictures WHERE
  pictures.user_id=member.id
  && pokes.pop='poke'
  && ((member.id=pokes.poker) && (pokes.poked=".$_SESSION['my_id'].")) ORDER BY pokes.poker");[/code]

Don't worry about the term "poke" it makes sense in the context of the website honest. ;)

The above code only finds records from people who have "poked" me... but not that I have poked back. Is there any way to do this in the same query? or will I need to do something else? If so... umm... what?

Thanks for your time.

[marcus]

Instead of using && use AND

select whatever from table WHERE field1=field1 AND field2=field2

[artacus]

[code]SELECT *
FROM pokes
JOIN member AS vote_by ON pokes.poker=vote_by.id
JOIN member AS vote_for ON pokes.poked=vote_for.id
WHERE pokes.pop='poke' AND (pokes.poker = 123 OR pokes.poked = 123)[/code]

[gerkintrigg]

artacus, that seems to make sense. BUT... I now want to make sure that it's only echoing the member's picture once...

Previously I used this:

[code]$count_row=0;
if ($dbl_pokes_sql){
while($dp=mysql_fetch_array($dbl_pokes_sql)){
if ($dp['poker']!=$donotrepeat){
$count_row++;
if ($count_row<5){
echo'<td valign="top" class="text" bgcolor="#FFFFFF"><div align="center">';
if ($dp['url']!=''){
echo'<a href="display.php?id='.$dp['poker'].'">
'.$dp['fname'].'<br>[/code] You get the idea...
Any suggestions?

[trq]

[quote]Instead of using && use AND[/quote]

&& and AND are exactly the same in mysql.

[gerkintrigg]

I know, but I didn't want to upset them. i use && because it's less to type.

[artacus]

No problem, do it like so:

[code]
SELECT *
FROM member AS m
JOIN pokes AS p ON p.poker = m.id OR poked = m.id
JOIN photo AS pic ON m.id = pic.id
WHERE p.poker = 123 OR p.poked = 123
GROUP BY m.id[/code]

BTW. Your apps will always perform better if you let SQL do your grouping, filtering and aggregate functions. You CAN do it in PHP but thats what databases were designed to do and they do it much faster. Not to mention your code will be more maintainable.

[fenway]

Depending on how your indexes are set up, the OR join condition and the GROUP BY may not utilize the proper indexes.