vb.org Archive - Need a JOIN Query

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reefland

07-13-2005 12:08 AM

Need a JOIN Query

I know nothing about JOIN queries and the more I read the worse off I am. Here is what I need.

I have 2 tables, one called post and one called thread. When a new "thread" is posted it is assigned a threadid (that is the column name). When a post is replied to the thread, the post table gets the threadid in a column called tid along with other information. I need a query that will do the following:

1. For each threadid in table thread, give me the total posts for that thread in the post table.
2. Give me the last (most recent) row for each threadid=tid

Here is the query I have tried (with several iterations) with no luck:

PHP Code:


		
			
$threads = mysql_query("SELECT t2.username, t2.userid, t2.posttitle, t2.posttext, t2.tid, t2.timestamp FROM post AS t2 INNER JOIN thread AS t1 ON t2.tid = t1.threadid WHERE t1.pluserid = '$_GET[userid]'");

Any JOINERS out there got any ideas??

sabret00the

07-13-2005 03:05 PM

PHP Code:


		
			
 $threads = mysql_query("

SELECT t2.username, t2.userid, t2.posttitle, t2.posttext, t2.tid, t2.timestamp

FROM post AS t2

LEFT JOIN thread AS t1 ON t2.tid = t1.threadid

WHERE t1.pluserid = " . trim(intval($_GET[userid])) . "

ORDER BY t2.timestamp DESC

");

that should work perfectly.

Marco van Herwaarden

07-13-2005 07:25 PM

What is the use of the join with the thread table?

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