Question

I´m trying to get a sum from the column of the repeated values that was selected in a form before, but i can´t even show the result, is there something wrong with this code?

DB Structure

table carros
-id
-matricula
-marca

table movimentos
-id
-matricula
-marca
-fornecedor
-tipo
-despesa
-observacoes

i have a form in the file “verificar.dwt.php” that contains a dropdown list with all the values in “matricula” (from the table carros) and when it selects the respective “matricula” it goes to “extra1.dwt.php” where it shows a table with all the repeated rows that have the same “matricula” value.

What i want to show now is the sum of that repeated rows.

<a href='verificar.dwt.php'>Voltar atrás</a>

<div align="center"><? 

include 'configmov.dwt.php'; 

$tableName='movimentos';
$matricula = mysql_real_escape_string($_POST['matricula']);

$sql="SELECT matricula, marca, despesa FROM ".$tableName." WHERE matricula = '".$matricula."'";
$result=mysql_query($sql); 

$result1 = mysql_query('SELECT SUM(value) AS value_sum FROM despesa'); 
$row1 = mysql_fetch_assoc($result1); 
$sum = $row1['value_sum'];

$n=1; 

echo "Os seus resultados: <p>";

echo "<table border=0>";
echo "<tr bgcolor='#CCFFCC'>";
echo "<td style='width: 100px;'>Matricula</td>";
echo "<td style='width: 100px;'>Marca</td>";
echo "<td style='width: 100px;'>Despesa</td>";
echo "</tr>";




while($row = mysql_fetch_array($result)){ 
    echo "<tr bgcolor='#CCCCCC'>";
    echo "<td style='width: 100px;'>".$row['matricula']."</td>";
    echo "<td style='width: 100px;'>".$row['marca']."</td>";
    echo "<td style='width: 100px;'>".$row['despesa']."</td>";
    echo "</tr>";

    echo $sum;
}

Answer 1

if you want to show it then you must show it on a column under a row but you closed your row attribute before displaying it may be it creates problem.and one more thing you put this query

$result1 = mysql_query('SELECT SUM(value) AS value_sum FROM despesa'); 

is despesa table name?? as i think it is colname if it is colname then your query should look like this

$result1 = mysql_query('SELECT SUM(despesa) AS value_sum FROM Tablename');