SQL 多行到多列的单行

Question

我在 SQL 中的表中有这些数据：

Product    Size     Colour    Number

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

Jacket       S       Red         3

Jacket       M       Red         2

Jacket       S       Green       5

Shirt        S       Blue        1

Shirt        L       Blue        9

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

Product   SRed    MRed    SGreen     SBlue    LBlue

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

Jacket     3       2        5

Shirt                                  1        9

这可能吗？如何实现？

谢谢

Answer 1

我不确定您是在寻找动态的还是静态的，但这将解决静态问题：

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