如何按SQL查詢排序和分組？

Question

我有資料

id Date      CatId  itemid itemname price
1  10/5/2019  1         1      ABC        20
2  10/5/2019  1         2      XYZ        30
3  10/5/2019  2         1      ABC        20
4  10/5/2019  3         1      ABC        20  

5  11/5/2019  1         2      XYZ        30
6  11/5/2019  2         1      ABC        20
7  11/5/2019  2         3      PQR        40

8  12/5/2019  3         1      ABC        20
9  12/5/2019  3         2      XYZ        30 
10  12/5/2019  1         2      XYZ        30
11  12/5/2019  2         1      ABC        20

預期結果數據

date            CatId   toal 
 10/5/2019      1           50
 10/5/2019      2           20
 10/5/2019      3           20

  11/5/2019     1       30
  11/5/2019     2       60
  12/5/2019     1       30
  12/5/2019     2       20
  12/5/2019     3       50

我想要按日期排列結果順序，然后按價格分組計算價格總和，

我已嘗試應用多個查詢，但獲得了確切的解決方案。 我花了很多時間。

我已經嘗試過以下查詢

SELECT * FROM (SELECT * FROM `table`  ORDER BY `date` DESC) as tbl
 GROUP BY tbl.`catid`

---

SELECT *
FROM `table` 
GROUP BY `date` ORDER BY `date` DESC

---

SELECT * 
FROM (
    SELECT * FROM `table`  
    ORDER BY `date` DESC
) AS sub
GROUP BY `catid` ORDER BY `date` DESC

Answer 1

您可以使用的排序依據和分組依據的列可以不同

您可以使用分組依據並直接求和

select date, catid, sum(price)
from my_table 
group by date, catid
order by date, sum(price), catid