在PHP中獲取MySQL列的總和

Question

我在表中添加一列並返回總和。我有一個循環，但它不工作。

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

echo $sum; 

Answer 1

您可以完全處理它在MySQL查詢：

SELECT SUM(column_name) FROM table_name; 

在PHP代碼，試試這個：

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

使用PDO（mysql_query折舊）

$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

$row['Value']可能是一個字符串。嘗試使用 intval($row['Value'])。

此外，請確保在循環之前設置了$sum = 0。

或者，更好的是，將SUM(Value) AS Val_Sum添加到您的SQL查詢中。

Answer 3

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

$result = mysql_query($query); 

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

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

} 

echo sum; 

Answer 4

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

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

Answer 5

我已經取代你的代碼，它工作得很好

$sum=0; 
while ($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

試試這個：

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

Answer 8

獲得一筆特定的行值使用PHP MYSQL

"SELECT SUM(filed_name) from table_name" 

Answer 9

MySQL 5.6（LAMP）。 column_value是您想要添加的列。 table_name是表格。

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：折舊（不使用）

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