MySQLのSUMとGROUP BYの列AS

Question

TABLE1構造とサンプルデータ

+----+-------------+----------+------+-------+ 
| ID | DESCRIPTION | QUANTITY | EACH | PRICE | 
+----+-------------+----------+------+-------+ 
| 1 | Product 1 |  1 | 12 | 1*12 | 
| 2 | Product 2 |  2 | 3 | 2* 3 | 
| 3 | Prodcut 3 | NULL | 3 |  | 
| 4 | Product 1 |  2 | 10 | 2*10 | 
| 5 | Product 3 | NULL | 7 |  | 
+----+-------------+----------+------+-------+ 

MySQLのクエリ：私はPRICE列にSUMを作ることができる方法

SELECT 
    DESCRIPTION, 
    QUANTITY, 
    EACH, 
    COALESCE(QUANTITY, 1) * EACH AS PRICE 
FROM table1 
GROUP BY DESCRIPTION 

とGROUP BY説明カラム？私はtable1の値を変更することができないので、UPDATEを使用したくありません。

Answer 1

なぜあなたは選択リストにSUM(COALESCE(QUANTITY, 1) * EACH) AS PRICETOTALを追加できません。

Answer 2

SELECT 
    DESCRIPTION, 
    SUM(COALESCE(QUANTITY,1)*each) as 'Price' 
FROM table1 
GROUP BY DESCRIPTION 


returns 
DESCRIPTION Price 
Product 1 32 
Product 2 6 
Product 3 10