銷售集中......樞軸還是轉置？

Question

必須找到總總銷售額作出並獲得總折扣，在2002年及2002年

表1還當月：的SalesOrderDetail

 - UnitPrice 
     - UnitPriceDiscount 
     - OrderQty 

表2：SalesOrderHeader的

 - OrderDate 

附上的是這兩個表的模式的捕捉

https://i.stack.imgur.com/f2b5A.png

我能設法得到的結果seperately但不理解如何 結合/聚集他們....是否使用轉或轉動......

#Yearly

select DATE_FORMAT(a.OrderDate,'%Y') AS Yearly,sum(b.UnitPriceDiscount) as DiscTotal, 
SUM((`UnitPrice` * OrderQty)-UnitPriceDiscount) AS total 

FROM SalesOrderHeader a join SalesOrderDetail b 

on b.SalesOrderID = a.SalesOrderID 

WHERE YEAR(OrderDate) = 2002 

group by Yearly 

order by MONTH(OrderDate) 

#CurMonthOfYear

select DATE_FORMAT(a.OrderDate,'%M') AS CurrentMonth,sum(b.UnitPriceDiscount) as DiscountAmt, 
SUM((`UnitPrice` * OrderQty)-UnitPriceDiscount) AS total 

FROM SalesOrderHeader a join SalesOrderDetail b 

on b.SalesOrderID = a.SalesOrderID 

WHERE month(OrderDate) = MONTH(NOW()) 

**的結果應該是以下格式**

Metrics    Yearly    CurMonthOfYear 

DiscountAmt   540.82       28.48 

TotalSales   303.17      237.2 

Answer 1

你的問題建議有條件的聚集。然而，這是最簡單的投入四列：

select sum(sod.UnitPriceDiscount) as DiscTotal_year, 
     sum((UnitPrice * OrderQty) - UnitPriceDiscount) AS total_year, 
     sum(case when month(sod.OrderDate) = month(now()) 
       then sod.UnitPriceDiscount else 0 
      end) as DiscTotal_month, 
     sum(case when month(sod.OrderDate) = month(now()) 
       then (UnitPrice * OrderQty) - UnitPriceDiscount else 0 
      end) as Total_month 
from SalesOrderHeader soh join 
    SalesOrderDetail sod b 
    on sod.SalesOrderID = soh.SalesOrderID 
where year(soh.OrderDate) = 2002 ; 

雖然可以轉動這得到它在不同的行，這將使查詢更復雜。

Answer 2

select a.Metrics , a.yearly , b.CurMonthOfyear FROM 
(
select 'DiscountAmt' as Metrics , sum(b.UnitPriceDiscount) as yearly 
FROM SalesOrderHeader a join SalesOrderDetail b 
on b.SalesOrderID = a.SalesOrderID 
WHERE YEAR(OrderDate) = 2002 

union all 

select 'TotalSales' as Metrics , SUM((b.UnitPrice * b.OrderQty)-b.UnitPriceDiscount) AS yearly 
FROM SalesOrderHeader a join SalesOrderDetail b 
on b.SalesOrderID = a.SalesOrderID 
WHERE YEAR(OrderDate) = 2002 

)a 

inner join 
(
select 'DiscountAmt' as Metrics , sum(b.UnitPriceDiscount) as CurMonthOfyear 
FROM SalesOrderHeader a join SalesOrderDetail b 
on b.SalesOrderID = a.SalesOrderID WHERE month(OrderDate) = MONTH(NOW()) 

union all 

select 'TotalSales' as Metrics , SUM((b.UnitPrice * b.OrderQty)-b.UnitPriceDiscount) AS CurMonthOfyear 
FROM SalesOrderHeader a join SalesOrderDetail b 
on b.SalesOrderID = a.SalesOrderID 
WHERE month(OrderDate) = MONTH(NOW()) 
) 

b ON a.Metrics = b.Metrics 

這不是透視或轉置，但查詢有助於獲得所需格式的輸出。