Re: Select and order by question

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On 5/3/06, Andy Dunlop <andy@xxxxxxxxxxxxx> wrote:

           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?

select * from crm_leads l, crm_events e where l.id=e.crm_leads_id and
follow_up_action != '' ORDER BY follow_up_date ASC LIMIT 1;

Make sure crm_events crm_leads_id has an index on id and cram_leads id..

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