mysql - 1 つのクエリで sum() 多くの列を選択するにはどうすればよいですか?

Question

Just Sample Table : Cus_fi.

できますか

SELECT SUM(dollar,euro,pound) FROM cus_fi ; in 1 query.

そして、このように年齢別の結果を表示します。

   20 - 25   1500    410     166
   26 - 30   5300    2000    584

学生が本当に知りたいのを助けてくれてありがとう。

Answer 1

Try this one:

SELECT age, SUM(dollar) AS Total_Dollar, SUM(Euro) AS Total_Euro, 
SUM(Pound) AS Total_Pound 
    FROM cus_fi GROUP BY age

EDIT:

SELECT CONCAT(2*floor(age/2), '-', 2*floor(age/2) + 2) as `age_range`, SUM(dollar) AS Total_Dollar, SUM(Euro) AS Total_Euro, 
SUM(Pound) AS Total_Pound 
    FROM cus_fi GROUP BY 1 ORDER BY age