如何在mysql請求的ORDER BY部分中總結多個int列？

Question

$first = mysql_query("SELECT * FROM feeds ORDER BY (number1 + number2) DESC LIMIT 1"); 

這不起作用。 number1和number2都是int列。

有什麼建議嗎？

Answer 1

SELECT * FROM feeds ORDER BY (select (sum(column1) + sum(column2)) from feeds) DESC LIMIT 1 

Answer 2

你可以使用僞場

SELECT *, (number1 + number2) as my_sum 
FROM feeds ORDER BY my_sum DESC LIMIT 1 

一個select_expr可以給使用AS ALIAS_NAME的別名。別名用作表達式的列名稱，可用於GROUP BY，ORDER BY或HAVING子句。

http://dev.mysql.com/doc/refman/5.5/en/select.html