在PHP中获取MySQL列的总和

Question

我在表格中有一个列，我想加起来并返回总和。我有一个循环，但它不起作用。

while ($row = mysql_fetch_assoc($result)){
    $sum += $row['Value'];
}

echo $sum;

Answer 1

您可以在MySQL查询中完全处理它：

SELECT SUM(column_name) FROM table_name;

在PHP代码中，试试这个：

$result = mysql_query('SELECT SUM(value) AS value_sum FROM codes'); 
$row = mysql_fetch_assoc($result); 
$sum = $row['value_sum'];

使用PDO（不推荐使用mysql_query）

$stmt = $handler->prepare("SELECT SUM(value) AS value_sum FROM codes");
$stmt->execute();

$row = $handler->fetchAll(PDO::FETCH_OBJ);
$sum = $row->value_sum;

Answer 2

$query = "SELECT * FROM tableName";
$query_run = mysql_query($query);

$qty= 0;
while ($num = mysql_fetch_assoc ($query_run)) {
    $qty += $num['ColumnName'];
}
echo $qty;

Answer 3

试试这个：

$sql = mysql_query("SELECT SUM(Value) as total FROM Codes");
$row = mysql_fetch_array($sql);
$sum = $row['total'];

Answer 4

$row['Value']可能是一个字符串。尝试使用intval($row['Value'])。

另外，请确保在循环前设置$sum = 0。

或者，更好的是，将SUM(Value) AS Val_Sum添加到SQL查询中。

Answer 5

我已经更换了您的代码并且运行良好

$sum=0;
while ($row = mysql_fetch_assoc($result)){
    $value = $row['Value'];

    $sum += $value;
}

echo $sum;

Answer 6

$result=mysql_query("SELECT SUM(column) AS total_value FROM table name WHERE column='value'");
$result=mysql_result($result,0,0);

Answer 7

$sql = "SELECT SUM(Value) FROM Codes";

$result = mysql_query($query);

while($row = mysql_fetch_array($result)){

    sum = $row['SUM(price)'];

}

echo sum;

Answer 8

MySQL 5.6（LAMP）。 column_value是您要添加的列。 table_name是表。

方法＃1

$qry = "SELECT column_value AS count
        FROM table_name ";

$res = $db->query($qry);

$total = 0;
while ($rec = $db->fetchAssoc($res)) {
    $total += $rec['count'];
}
echo "Total: " . $total . "\n";

方法＃2

$qry = "SELECT SUM(column_value) AS count 
        FROM table_name ";

$res = $db->query($qry);

$total = 0;
$rec = $db->fetchAssoc($res);
$total = $rec['count'];

echo "Total: " . $total . "\n";

方法＃3 -SQLi

$qry = "SELECT SUM(column_value) AS count 
        FROM table_name ";

$res = $conn->query($sql);

$total = 0;
$rec = row = $res->fetch_assoc();
$total = $rec['count'];

echo "Total: " . $total . "\n";

方法＃4：折旧（不使用）

$res = mysql_query('SELECT SUM(column_value) AS count FROM table_name'); 
$row = mysql_fetch_assoc($res); 
$sum = $row['count'];

Answer 9

使用PHP MYSQL获取特定行值的总和

"SELECT SUM(filed_name) from table_name"

Answer 10

这里是一个例子： 在数据库/表中查看所有字段名称的图像。

我们要添加日期“ 09-10-2018”中的“ duration_sec”列的所有值，并且仅添加状态“ off”

下面是sql查询：

$sql_qry="SELECT SUM(duration_sec) AS count FROM tbl_npt WHERE date='09-10-2018' AND status='off'";

$duration = $connection->query($sql_qry);
while($record = $duration->fetch_array()){
    $total = $record['count'];
}

echo $total