如何對列中包含某些item_id且狀態對應的狀態=未決的列求和

Question

這是我的表，看起來像：

id | Prs Id | Amount | Status | Item Id|
----------------------------------------
1  |   10   |   200  |pending | 5      |
2  |   10   |   300  |pending | 7      |
3  |   10   |   400  |pending | 9      |
4  |   10   |   100  |received| 6      |
5  |   10   |   200  |received| 8      |
6  |   10   |   300  |received| 3      |
7  |   10   |   200  |pending | 5      |
8  |   10   |   300  |pending | 7      |
9  |   10   |   400  |pending | 9      |
10 |   10   |   100  |received| 6      |
11 |   10   |   200  |received| 8      |
12 |   10   |   300  |received| 3      |

如何從也具有pending status的特定item_id獲取總amount ？

Answer 1

這是該查詢：

select sum(Amount)
  from TableName
 where Status = 'pending'  
   and Item_ID = 7