php - 检索一列的少数选定行的总和？

Question

我试图在数据库中获取几行选定的 Money Column 行的总和。

sql如下。

$sql_total_money = "SELECT SUM(Money) as TotalMoney FROM accounts WHERE Program='PSC' BranchId='13' and ExamYear='2013'";
$result_total_money=mysql_query($sql_total_money,$link)or die($sql_total_money."<br/><br/>".mysql_error());
$row_total_money=mysql_fetch_array($result_total_money);

由于 die 功能，这会出现如下错误。

SELECT SUM(Money) as TotalMoney FROM accounts WHERE Program='PSC' BranchId='10' and ExamYear='2013'

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'BranchId='10' and ExamYear='2013'' at line 1

我能做什么，解决方案是什么？

Answer 1

您错过了ANDafter Program='PSC'：

SELECT SUM(Money) as TotalMoney
FROM   accounts
WHERE  Program='PSC'
       AND BranchId='10'
       AND ExamYear='2013'

Answer 2

您需要使用条件运算符来组合您的条件，AND/OR例如

SELECT SUM(Money) as TotalMoney 
FROM accounts 
HAVING Program='PSC' and
BranchId='10' and 
ExamYear='2013'