PHP/MYSQL：我如何計算字段+其他字段+其他字段的值

Question

我有一個mysql表，它包含一個名爲'id'，'name'和'number'的字段。

每一行的字段'數字'，都有一個數字。

id name number 

1 test 30 

2 test2 40 

3 lala 23 


total = 93 

如何計算（加）所有行的數量？

$row['number']+$row['number']+$row['number'] = .. an other number. 

Answer 1

試試這個

SELECT SUM(number) AS total FROM table; 

Answer 2

您可以查詢該表是這樣的：

select sum(number) from table; 

，並有mysql算一下。

Answer 3

SELECT name, SUM(number) FROM table GROUP BY name

我假設你想有名字的總和。

SELECT SUM(number) FROM table

不進行分組。

http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_sum更多信息

Answer 4

嘗試做的Thuis

select number ,sum(number) as total from table; 

然後做

$row['total'] // and it gives u the total sum 

Answer 5

在PHP層：

$cnt = 0; 
while($row = mysql_fetch_assoc($result)) { 
    $cnt += $row['yourfield']; 
} 

在MySQL的LEVE：

SELECT SUM(yourfield) 
FROM yourtable 
GROUP BY yourfield