Re: Select and order by question

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От	Andy Dunlop
Тема	Re: Select and order by question
Дата	10 мая 2006 г. 07:59:07
Msg-id	1147247895.6686.88.camel@localhost.localdomain обсуждение исходный текст
Ответ на	Re: Select and order by question ("Sherwin M. Harris" <Sherwin_Harris@byu.edu>)
Список	pgsql-php

Дерево обсуждения

If anyone is interested, here is the code we eventually have used:

<?php
$sSql = "select id from crm_leads ";
$sLeads = pg_exec($conn,$sSql);
for($e=0;$e<pg_numrows($sLeads);$e++){
    $sSql = "SELECT * FROM crm_events where crm_leads_id = ".pg_result($sLeads,$e,"id")." and follow_up_action!='' ORDER BY follow_up_date desc limit 1";
     $sRes = pg_exec($conn,$sSql);
     $sHits = pg_numrows($sRes);

        if($sHits!=0){

                for($i=0;$i<$sHits;$i++){

                        $temp_date = explode("-",pg_result($sRes,$i,"follow_up_date"));
                        $temp_tstamp = gmmktime(0,0,0,$temp_date[1],$temp_date[2],$temp_date[0]);
                        $array_echo[$temp_tstamp] .= "<tr><td>".$compName1."</td><td>".$empl1."</td><td>".pg_result($sRes,$i,"date")."</td><td>".pg_result($sRes,$i,"description")."</td><td>".pg_result($sRes,$i,"type")."</td><td>".pg_result($sRes,$i,"follow_up_action")."</td><td>".pg_result($sRes,$i,"follow_up_date")."</td><td><a href='crm_events_edit.php?id=".pg_result($sRes,$i,"id")."'>Edit</a></td><td><a href='crm_events_bycomp.php?id=".pg_result($sRes,$i,"crm_leads_id")."'>Action</a></td></tr>";
                }
    }
}
?>
<html>
<head>
<title>
CRM - Events
</title>
</head>
<body bgcolor="<?echo $sBodyColor?>">
<?php require("menu.php"); ?>
<table width='100%'>
<tr><td><h2><font color='<? echo $sHeadingColor?>'>Events Requiring Action</font></h2></td>
<td align='right'><a href='manual/crm_events.html' target='_blank'><img src='images/help_btn.jpg' border=0></a></td>
</table>
<? asort($array_echo); ?>
<? foreach($array_echo as $ae){
        echo $ae;
   }
?>
<? echo $prog_echo_end; ?>
</body>
</html>

The limit 1 gets us the last qualifying event on each lead, and this result is stuck into an array which is sorted by follow_up_date prior to display.

I probably didn't explain the problem too well! But thanks for the input.
Andy

On Wed, 2006-05-03 at 08:56 -0600, Sherwin M. Harris wrote:

Assuming you are using a version of a database that can support sub-queries (MySQL 4.1 and up, Postgresql (all reasonably current versions, any other robust RDBMS) you can do the query like this:

$sSql = "SELECT * FROM crm_events WHERE crm_leads_id IN (SELECT id FROM crm_leads) AND follow_up_action!='' ORDER BY follow_up_date asc limit 1"

Not sure what your follow_up_action !=” is suppose to be doing but if the rest works for you that should give you what you want.

Sherwin Harris

Web Developer

Brigham Young University

From:pgsql-php-owner@postgresql.org [mailto:pgsql-php-owner@postgresql.org] On Behalf Of Andy Dunlop
Sent: Wednesday, May 03, 2006 3:13 AM
To: pgsql-php@postgresql.org
Subject: [PHP] Select and order by question

Hi - I have the following code:

//show table of current events needing action
$sSql = "SELECT id FROM crm_leads ";
$sLeads = pg_exec($conn,$sSql);
for($e=0;$e<pg_numrows($sLeads);$e++){
        $sSql = "SELECT * FROM crm_events WHERE crm_leads_id = ".pg_result($sLeads,$e,"id")." AND follow_up_action!='' ORDER BY follow_up_date asc limit 1";
        $sRes = pg_exec($conn,$sSql);
        $sHits = pg_numrows($sRes);
        if($sHits!=0){
                for($i=0;$i<$sHits;$i++){
              // generate the display here
        }
}

crm_leads is a parent with many crm_events as it's children.
This code gives me the correct set of rows.
My problem is that I want only the last row from crm_events (as per limit 1) but I want those rows sorted by follow_up_date. I guess I need to have the whole query in one select statement? But how?

Any help appreciated
Thanks

Andy Dunlop

www.infocus.co.za
+27 21 532 0335 office
+27 82 770 8749 mobile