Question

如何总结从列中获得的用户总数＆＃34;价格＆＃34;值？

$statement = "SELECT user_id, SUM(price) FROM tbl_post WHERE user_id= ".'$_SESSION['user']';
$statement = mysql_query($statement);
$user_earning= mysql_fetch_row($statement);
echo $user_earning;

Answer 1

您的SQL查询应如下所示：

select user_id,sum(price) from tbl_post where user_id=? group by user_id;

Answer 2

你应该在select statment

中添加GROUP BY子句

rendered !

写上面的查询而不是这个查询

$statement = "SELECT user_id, SUM(price)
             FROM tbl_post 
             WHERE user_id= ".'$_SESSION['user']". "
             GROUP BY user_id";

我不知道php，但是通过查看您的查询，您想要总结一个特定用户的所有价格。

Answer 3

试试这个，你的查询中有错误：

$statement = "SELECT user_id, SUM(price) FROM tbl_post WHERE user_id= '".$_SESSION['user']."' ";
$statement = mysql_query($statement); 
$user_earning= mysql_fetch_row($statement); 
echo $user_earning[1];// echo $user_earning['price'];

我如何总结总金额

3 个答案: