Question

我有这个查询

$my_taxes = mysql_fetch_array(mysql_query("SELECT SUM(FEE) FROM clients WHERE EMAIL = '$EMAIL'"));

另外，我有一个名为付款的辅助表，其中列（PAID）带有2个ENUM选项（待定和准备好）

我需要获取一个变量，该变量通过来自表客户端的特定电子邮件来计算总费用，但仅当辅助表中的PAID列值被选为待定时才会这样。

这是我到现在为止所尝试的

$my_taxes = mysql_fetch_array(mysql_query("SELECT SUM(FEE) FROM clients WHERE EMAIL = '$EMAIL' UNION ALL SELECT PAID FROM payments WHERE EMAIL = '$EMAIL' AND PAID = 'pending' "));

更新2

表1 payments 表2 clients

输出 50 | 预期 25

Answer 1

尝试查询

SELECT SUM(FEE) FROM clients
       INNER JOIN payments ON payments.ID = clients.SID AND PAID = 'pending'
       WHERE clients.EMAIL = '$EMAIL'

来自表1的SUM值与来自表2的ENUM条件

1 个答案: