mysql列中除最后一行外的所有单元格的总和

Question

I am getting sum of all cells in column with following query..

$result = mysql_query("select SUM(previous_balance) as balance from table_name ");
 $row = mysql_fetch_assoc($result);   
 $item_number = $row['balance'];
 $total1 = $item_number ;

 echo $total1; 

But I want to Omit last cell value in SUM. How can I do it ?

Answer 1

根据这个答案 （如果我没看错的话），下面的内容应该可以选择除最后一行以外的所有内容，然后使用它来汇总所有项目

SELECT SUM(previous_balance) as balance FROM table_name WHERE my_primary_key <> (SELECT MAX(my_primary_key) FROM table_name);