创建MySQL临时表并在PHP中从中选择

Question

I need an advice with a PHP/MySQL code I am writing. What I need to do is to create a temp table and then select from it. Problem is that the temp table only lasts during the query that created it so the second query in PHP is empty.

Here are both queries, I assume the solution would be to merge them into one singe query but so far nothing I tired works.

The queries below work in phpMyAdmin if executed one after another.

The temporary table query:

$sql_temp_table = "CREATE TEMPORARY TABLE IF NOT EXISTS 
                   tbl_temp (id INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY) AS 
                  (SELECT 
                        SUM(number_active_ads) as active_ads, 
                        MONTH(create_date) as month, 
                        YEAR(create_date) as year, 
                        dealer_id as dealer_id 
                  FROM tbl_active_ads
                  WHERE dealer_id = '".$rs->fields['id']."' 
                  GROUP BY year, month 
                  ORDER BY id)";
$rs_temp_table  =   $db -> Execute($sql_temp_table);

The second SELECT query:

$qry_chk_active_ads = "SELECT 
                            a.*, 
                            t.user_dealer_id, 
                            t.dealer_payment_for_month, 
                            t.dealer_payment_for_year
                       FROM tbl_temp as a
                       LEFT OUTER JOIN tbl_transaction as t
                       ON (a.dealer_id = t.user_dealer_id 
                           AND a.month = t.dealer_payment_for_month 
                           AND a.year = t.dealer_payment_for_year) 
                       ORDER BY id DESC 
                       LIMIT 3";
$rs_chk_active_ads  =   $db -> Execute($qry_chk_active_ads);

UPDATE: When I do this: var_dump($rs_temp_table); I get the following output from PHP:

object(ADORecordSet_empty)#6 (6) { ["dataProvider"]=> string(5) "empty" ["databaseType"]=> bool(false) ["EOF"]=> bool(true) ["_numOfRows"]=> int(0) ["fields"]=> bool(false) ["connection"]=> bool(false) }

Maybe this is explaining why the temp_table seems to be empty in PHP?

Answer 1

Why not simply use...

SELECT a.*
     , t.user_dealer_id
     , t.dealer_payment_for_month
     , t.dealer_payment_for_year
  FROM 
     ( SELECT SUM(number_active_ads) active_ads
            , DATE_FORMAT(create_date,'%Y-%m') yearmonth
            , dealer_id 
         FROM tbl_active_ads
        WHERE dealer_id = '".$rs->fields['id']."' 
        GROUP 
           BY DATE_FORMAT(create_date,'%Y-%m') 
     ) a
  LEFT 
  JOIN tbl_transaction t
    ON a.dealer_id = t.user_dealer_id 
   AND a.yearmonth = MONTH(t.dealer_payment_for_month)
   AND a.yearmonth = YEAR(t.dealer_payment_for_year) 
 ORDER 
    BY id DESC 
 LIMIT 3;