Mysql 如何在此查询中求m1和m2之和

我有一个查询结果显示 现在，我需要求和m1，m2

查询是：

select metraj, fee, tedad, fee_tedad,
       metraj * fee AS m1,
       tedad * fee_tedad AS m2 
from content 
where id = 54 

你喜欢这样吗

select metraj, fee, tedad, fee_tedad,
       metraj * fee AS m1,
       tedad * fee_tedad AS m2,
       metraj * fee+tedad * fee_tedad as sum
from content 
where id = 54

你喜欢这样吗

select metraj, fee, tedad, fee_tedad,
       metraj * fee AS m1,
       tedad * fee_tedad AS m2,
       metraj * fee+tedad * fee_tedad as sum
from content 
where id = 54

---

以下方面应起作用：

select metraj, fee, tedad, fee_tedad, (metraj * fee) + (tedad * fee_tedad) AS someVariable, from content where id = 54 

如果您同时需要m1和m2，请使用以下各项：

select metraj, fee, tedad, fee_tedad, metraj * fee AS m1, tedad *fee_tedad AS m2, (metraj * fee) + (tedad * fee_tedad) AS someVariable  from content  where id = 54 

---

以下方面应起作用：

select metraj, fee, tedad, fee_tedad, (metraj * fee) + (tedad * fee_tedad) AS someVariable, from content where id = 54 

如果您同时需要m1和m2，请使用以下各项：

select metraj, fee, tedad, fee_tedad, metraj * fee AS m1, tedad *fee_tedad AS m2, (metraj * fee) + (tedad * fee_tedad) AS someVariable  from content  where id = 54 

---

尝试添加

metraj*fee+tedad*fee\u tedad

。您不能使用

SELECT

中

SELECT

子句的别名。标记jquery的原因是什么？当您说sum时，是指每行的总和还是所有行的总和？尝试添加

metraj*fee+tedad*fee\u tedad

。您不能使用

SELECT

中

SELECT

子句的别名。为什么要标记jquery？当您说sum时，是指每行还是所有行的总计？