Re: Select and order by question

Andy Dunlop <andy@xxxxxxxxxxxxx> · Wed, 10 May 2006 09:58:14 +0200

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=''>Edit</a></td><td><a href=''>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='' target='_blank'><img src='' 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@xxxxxxxxxxxxxx [mailto:pgsql-php-owner@xxxxxxxxxxxxxx] On Behalf Of Andy Dunlop

    Sent: Wednesday, May 03, 2006 3:13 AM

    To: pgsql-php@xxxxxxxxxxxxxx

    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 

Andy Dunlop

www.infocus.co.za

+27 21 532 0335 office

+27 82 770 8749 mobile