SQL多行到多行的单行

Question

我在SQL中的表中包含这些数据：

Product    Size     Colour    Number

-------    ----     ------    ------

Jacket       S       Red         3

Jacket       M       Red         2

Jacket       S       Green       5

Shirt        S       Blue        1

Shirt        L       Blue        9

我想通过将所有相同的产品行组合成这样的东西来动态转换它，而不知道我可能有多少行：

Product   SRed    MRed    SGreen     SBlue    LBlue

-------   ----    ----    ------     -----    -----

Jacket     3       2        5

Shirt                                  1        9

这可能吗？如何？

由于

Answer 1

I'm not sure if you are looking for something dynamic or static, but this will solve a static issue:

declare  @SRed As int
set @SRed =  (Select Number from YourTable where Size = 'S' and Colour = 'Red' and Product = 'Jacket')
declare @MRed As int
set @MRed = (Select Number from YourTable where Size = 'M' and Colour = 'Red' and Product = 'Jacket')
declare @SGreen As int
set @SGreen = (Select Number from YourTable where Size = 'S' and Colour = 'Green' and Product = 'Jacket')
declare @SBlue As int
set @SBlue = (Select Number from YourTable where Size = 'S' and Colour = 'Blue' and Product = 'Shirt')
declare @LBlue As int
set @LBlue = (Select Number from YourTable where Size = 'L' and Colour = 'Blue' and Product = 'Shirt')
Create Table #Jacket(Product varchar(20), SRed int, MRed int, SGreen int, IsInTable int)

insert into #Jacket(Product, SRed, MRed, SGreen)
Values(
'Jacket',
@SRed,
@MRed,
@SGreen
)
insert into #Jacket(Product, SRed, MRed, SGreen)
Values(
'shirt',
0,
0,
0
)

Create Table #Shirt(Product varchar(20), SBlue int, LBlue int)
insert into #Shirt(Product, SBlue, LBlue)
Values(
'Shirt',
@SBlue,
@LBlue
)

insert into #Shirt(Product, SBlue, LBlue)
Values(
'Jacket',
0,
0
)
Select s.Product, j.SRed, j.MRed, j.SGreen, s.SBlue, s.LBlue  
from #Shirt s
left outer join #Jacket j on j.Product = s.Product