php - Join Two Different Table -


i tried subtracting 2 different table same "pocde" column. have stated code below, doesn't work me. idea? 

$result = mysql_query("     select          productlist.*,          sum(rreturn.total)-sum(rreturn.total) totals,          sum(rsales.tax)-sum(rreturn.tax) tax     productlist     left join rsales on rsales.pcode = productlist.pcode     left join rreturn on rreturn.pcode = productlist.pcode     group pcode     order total asc");      while($row = mysql_fetch_array($result)) {             echo '<tr>';             echo '<td style = "background-image:url(images/buts1.png)">'.($row['totals'].'</td>';                echo '<td style = "background-image:url(images/buts1.png)">'.($row['tax'].'</td>';                           echo '</tr>';     }

you can't query because of group by. change query that:

 select pl.*, plagg.totals, plagg.tax productlist pl inner join (     select          productlist.pcode,          sum(rreturn.total)-sum(rreturn.total) totals,          sum(rsales.tax)-sum(rreturn.tax) tax      productlist     left join rsales on rsales.pcode = productlist.pcode     left join rreturn on rreturn.pcode = productlist.pcode     group productlist.pcode ) plagg on (plagg.pcode = pl.pcode)

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