SQL 加价生产 table 个蛋糕

Question

我真的希望有人能帮我解决这个 sql 查询，我一直在绞尽脑汁，但我知道这是可能的...这是我当前的查询并生成正确的格式：

DECLARE
@Price1 NVARCHAR(20),
@Price2 NVARCHAR(20),
@Price3 NVARCHAR(20),
@Price4 NVARCHAR(20)

SET @Price1 = (select Price from CakeSize where SizeId = '1')
SET @Price2 = (select Price from CakeSize where SizeId = '2')
SET @Price3 = (select Price from CakeSize where SizeId = '3')
SET @Price4 = (select Price from CakeSize where SizeId = '4')

SELECT

c.Name_en as Flavor,
@Price1 as Price1,
@Price2 as Price2,
@Price3 as Price3,
@Price4 as Price4


FROM
cake a
 Left outer JOIN CakeSize b ON a.SizeId = b.SizeId
 Left outer JOIN CakeFlavor c ON a.FlavorId = c.FlavorId
 Left outer JOIN CakeFilling d ON a.FillingId = d.FillingId
 Left outer JOIN CakeIcing f ON a.IcingId = f.IcingId
group by c.Name_en

我似乎无法从所有表格和显示中获得所有价格的总和。

我可以检索数据但不能像上面那样格式化？

SELECT 

   c.Name_en as Flavor,
   ISNULL(b.Price, 0) + ISNULL(c.Price, 0) + ISNULL(d.Price, 0) +  ISNULL(f.Price, 0) as aPrice,
   ISNULL(b.Price, 0) + ISNULL(c.Price, 0) + ISNULL(d.Price, 0) + ISNULL(f.Price, 0) as bPrice,
  ISNULL(b.Price, 0) + ISNULL(c.Price, 0) + ISNULL(d.Price, 0) + ISNULL(f.Price, 0) as cPrice,
    ISNULL(b.Price, 0) + ISNULL(c.Price, 0) + ISNULL(d.Price, 0) + ISNULL(f.Price, 0) as dPrice

FROM
   cake a
          Left Outer JOIN CakeSize b
                 ON a.SizeId = b.SizeId
          Left Outer JOIN CakeFlavor c
                 ON a.FlavorId = c.FlavorId
          Left Outer JOIN CakeFilling d
                 ON a.FillingId = d.FillingId
          Left Outer JOIN CakeIcing f
                 ON a.IcingId = f.IcingId

我想要上面的输出，而不是巧克力蛋糕的 4 行； 1 排巧克力蛋糕。（萝卜糕比其他的便宜$5）正确的数据，错误的格式 aPrice 列第 1、2、3、4 行包含巧克力蛋糕的正确值。

（想要每种口味的以下格式）

巧克力 18.95 18.95 23.50 38.50

Answer 1

好的，所以你想获得按大小分组的所有口味的总价，总价是每种口味的价格+馅料的价格+糖衣的价格，对吗？

选项 1。如果大小是静态的并且永远不会改变，你可以这样做

select Flavor, SUM(aPrice) as aPrice, SUM(bPrice) as bPrice, SUM(cPrice) as cPrice, SUM(dPrice) as dPrice
from (
    select c.Name_en as Flavor, 
        ISNULL(b.Price, 0) + ISNULL(c.Price, 0) + ISNULL(d.Price, 0) +  ISNULL(f.Price, 0) as aPrice,
        0 as bPrice, 0 as cPrice, 0 as dPrice
    from cake a 
        Left JOIN CakeSize b ON a.SizeId = b.SizeId
        Left JOIN CakeFlavor c ON a.FlavorId = c.FlavorId
        Left JOIN CakeFilling d ON a.FillingId = d.FillingId
        Left JOIN CakeIcing f ON a.IcingId = f.IcingId
    where b.sizeid = '1'

    UNION ALL

    select c.Name_en as Flavor, 0 as aPrice,
        ISNULL(b.Price, 0) + ISNULL(c.Price, 0) + ISNULL(d.Price, 0) +  ISNULL(f.Price, 0) as bPrice, 
        0 as cPrice, 0 as dPrice
    from cake a 
        Left JOIN CakeSize b ON a.SizeId = b.SizeId
        Left JOIN CakeFlavor c ON a.FlavorId = c.FlavorId
        Left JOIN CakeFilling d ON a.FillingId = d.FillingId
        Left JOIN CakeIcing f ON a.IcingId = f.IcingId
    where b.sizeid = '2'

    UNION ALL

    select c.Name_en as Flavor, 0 as aPrice, 0 as bPrice,
        ISNULL(b.Price, 0) + ISNULL(c.Price, 0) + ISNULL(d.Price, 0) +  ISNULL(f.Price, 0) as cPrice,
        0 as dPrice
    from cake a 
        Left JOIN CakeSize b ON a.SizeId = b.SizeId
        Left JOIN CakeFlavor c ON a.FlavorId = c.FlavorId
        Left JOIN CakeFilling d ON a.FillingId = d.FillingId
        Left JOIN CakeIcing f ON a.IcingId = f.IcingId
    where b.sizeid = '3'

    UNION ALL

    select c.Name_en as Flavor, 0 as aPrice, 0 as bPrice, 0 as cPrice, 
        ISNULL(b.Price, 0) + ISNULL(c.Price, 0) + ISNULL(d.Price, 0) +  ISNULL(f.Price, 0) as dPrice
    from cake a 
        Left JOIN CakeSize b ON a.SizeId = b.SizeId
        Left JOIN CakeFlavor c ON a.FlavorId = c.FlavorId
        Left JOIN CakeFilling d ON a.FillingId = d.FillingId
        Left JOIN CakeIcing f ON a.IcingId = f.IcingId
    where b.sizeid = '4'        
) a
where flavor is not null
group by Flavor

选项 2。如果大小是动态的，你可以在列和行之间转置...... 你可以在这里学习：Simple way to transpose columns and rows in Sql?

已编辑：在第三个和第四个 select 之间添加 'UNION ALL'，感谢 Sam Ax 编辑：在第二个查询中添加逗号编辑：添加 "where flavor is not null" 以避免 null flavor

Answer 2

我可以完成这个，但我认为必须有更好的方法it.so我只是把它放在这里作为备用答案

首先，我们现在可以创建一个 table 来存储您 table 的数据并添加一个尺寸列：

 SELECT 
  c.Name_en as Flavor,
  b.SizeId,
   ISNULL(b.Price,0)+ISNULL(c.Price,0)+ISNULL(d.Price,0)+ISNULL(f.Price,0) as Price -- do the price 4 times is meaningless so i cut them out just keep 1 left
 INTO #cakeP --i saw your tag as sqlserver so i create temp table like this
  FROM
  cake a
      Left Outer JOIN CakeSize b
             ON a.SizeId = b.SizeId
      Left Outer JOIN CakeFlavor c
             ON a.FlavorId = c.FlavorId
      Left Outer JOIN CakeFilling d
             ON a.FillingId = d.FillingId
      Left Outer JOIN CakeIcing f
             ON a.IcingId = f.IcingId

然后我们必须做 1 件蠢事：

    select 
       coalesce(a.Flavor,b.Flavor,c.Flavor,d.Flavor) as Flavor,
       a.price as aPrice,
       b.price as bPrice,
       c.price as cPrice,
       d.price as dPrice
       from 
         (select Flavor,size,price from #cakeP where SizeId=1) a
       full join (select Flavor,size,price from #cakeP where SizeId=2) b
            on a.Flavor = b.Flavor
       full join (select Flavor,size,price from #cakeP where SizeId=3) c
            on a.Flavor = c.Flavor
       full join (select Flavor,size,price from #cakeP where SizeId=4) d
            on a.Flavor = d.Flavor

它会完成的。

注：

如果 Flavor 没有大小 1 那么这将被搞砸 -- 好吧，我找到了解决这个问题的方法使用完全连接！
Flavor 的大小为 1 就可以了，但会发生这种情况：

exp：风味巧克力尺寸 1、3、4。那么数据将是这样的：chocolate 10 null 30 40

希望对您有所帮助

SQL 加价生产 table 个蛋糕

SQL adding prices to produce table of cakes

sql

sql-server

multiple-columns

multi-table