Question

我有一个看起来像这样的产品表

ProductId Cost
1     200       
2     800       
3     630

，我有一个statusProduct像这样：

StatusId ProductId StatusDate ProductStatus
1           ,1      ,1-1-17       ,1
2           ,1      ,2-12-17      ,2
3           ,2      ,21-5-17       ,1
4           ,3      ,11-5-18       ,1
5           ,2      ,18-5-18       ,2
6           ,2      ,10-8-18       ,1

我需要查询每个月（月1号）的SUM等于“ ProductStats”为产品成本的1，因此查询应如下所示：

Year Month Costs
2017   1    200
2017   2    200
2017   3    200
2017   4    200
2017   5    200
2017   6    1000
2017   7    1000
2017   8    1000
2017   9    1000
2017   10   1000
2017   11   1000
2017   12    1000
2018   1     800

Answer 1

您想加入两个表并进行分组，诸如此类。一个额外的挑战可能是您日期列的数据类型。（VARCHAR？）。然后事情可能会变得有点丑。

SELECT '20' + RIGHT (StatusDate, 2) AS YEAR,
        CASE WHEN LEFT (RIGHT ('StatusDate', 5), 1) = '-' THEN RIGHT (LEFT (RIGHT ('StatusDate', 5), 2), 1)
        ELSE LEFT (RIGHT ('StatusDate', 5), 2) END AS MNTH,
        SUM (Cost) AS TotalCosts
FROM TableA AS A
INNER JOIN TableB AS B ON B.ProductId = A.ProductId 
GROUP BY '20' + RIGHT (StatusDate, 2),
CASE WHEN LEFT (RIGHT ('StatusDate', 5), 1) = '-' THEN RIGHT (LEFT (RIGHT ('StatusDate', 5), 2), 1)
     ELSE LEFT (RIGHT ('StatusDate', 5), 2)

更好的选择是更改数据类型。

祝你好运！

Answer 2

假设Simon的评论是正确的，您可以尝试执行以下操作：

SELECT DATEPART(year, StatusDate) As 'Year', DATEPART(month, StatusDate) AS 'Month', SUM(Cost) As 'Cost' FROM
Products p
INNER JOIN
StatusProducts sp
ON
p.ProductId = sp.ProductId
WHERE 
sp.ProductStatus = 1
GROUP BY
DATEPART(year, StatusDate), DATEPART(month, StatusDate)

Answer 3

您需要使用窗口功能来获得运行总计

DECLARE  @Years TABLE ([year] int)
DECLARE @months TABLE([month] INT)

INSERT INTo @years([year])
VALUES(2017),(2018)

INSERT INTo @months([month])
VALUES(1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12)


select Y.YEAR,M.MONTH,ISNULL(SUM(Costs) OVER(Partition By Y.Year ORDER BY Y.YEAR,M.MONTH),0) Costs from @years Y
CROSS JOIN @months M
LEFT JOIN (
select YEAR(STatusDate) Year,MONTH(StatusDate) Month,SUM(Cost) Costs from products P
JOIN StatsProduct PS ON P.id= PS.productID
GROUP BY YEAR(STatusDate) ,MONTH(StatusDate)) ProdStats
ON ProdStats.Year=Y.Year and ProdStats.Month=M.Month

SQL Server日期和状态之间的查询

3 个答案: