添加的所有號碼

Question

排

我有一個這樣的數據庫：

ID | AMOUNT 
1   15.00 
2   100.00 
3   100.00 

我需要所有的金額加在一起。我已經嘗試了一些PHP數學的東西，但不能讓它工作。

<?php 
$total = mysql_query("SELECT amount FROM payments") 
or die(mysql_error()); 

$grandtotal= 
    while($total1 = mysql_fetch_array($total)) { 

$total1['amount']+ 


}; 

?> 

Answer 1

SELECT SUM(amount) as sum_amount FROM payments 

Answer 2

有針對特定任務兩種解決方案，你要完成：

while($total1 = mysql_fetch_array($total)) { 

$total1['amount']++; //returns Returns $total1['amount'], then increments it by one. 

} // <-- semicolon removed 

---

正如馬克·貝克在評論建議，你可以從你的SQL中做查詢使用SUM：

SELECT SUM(amount) AS amount_sum FROM payments