某些日期的SQL Server查詢計數銷售物品

Question

我想編寫一個查詢並在其中使用子查詢，結果集將是特定日期內銷售物品的計數。

表是這樣的：

item_name  sold   date 
------------------------------------ 
A     20   10.1 
B     10   10.3 
A     10   10.5 
C     20   10.4 
A     30   10.8 

，結果集將是這樣的：

item_name  sold   date 
------------------------------------- 
A     20   10.1 
B     10   10.3 
A     30   10.5 
C     20   10.4 
A     60   10.8 

Answer 1

你可以用下面的查詢

select t1.item_name, 
     (select sum(sold) from table1 t2 where t2.date <= t1.date 
      and t2.item_name = t1.item_name) as sold, 
     t1.date 
from table1 t1 

ISN去這是如此sipmle ... sql是非常簡單的局域網guage ...只是你必須爲冷靜思考你的問題:)

Answer 2

select t1.item_name, sum(t1.sold) as sold, t2.date 
from myTable t1 
    inner join myTable t2 on (t1.item_name = t2.item_name) and (t1.date <= t2.date) 
group by t1.item_name, t2.date