Pivot / Unpivot

create table Cart
(
    Product varchar(32),
    Color varchar(32),
    Nr int
)

insert into Cart values ('car','blue',3)
insert into Cart values ('car','red',2)
insert into Cart values ('car','black',3)
insert into Cart values ('car','white',1)
insert into Cart values ('car','blue',1)
insert into Cart values ('carrot','blue',3)
insert into Cart values ('carrot','red',2)
insert into Cart values ('onion','black',3)
insert into Cart values ('onion','white',1)
insert into Cart values ('car','blue',1)
insert into Cart values ('beer','blue',3)
insert into Cart values ('car','red',2)
insert into Cart values ('car','black',3)
insert into Cart values ('beer','white',1)
insert into Cart values ('car','blue',1)
insert into Cart values ('carrot','blue',3)
insert into Cart values ('beer','red',2)
insert into Cart values ('onion','black',3)
insert into Cart values ('onion','white',1)
insert into Cart values ('car','blue',1)
insert into Cart values ('car','blue',1)
insert into Cart values ('beer','blue',3)
insert into Cart values ('car','red',2)
insert into Cart values ('beer','black',3)
insert into Cart values ('beer','white',1)
insert into Cart values ('car','blue',1)
insert into Cart values ('car','blue',3)
insert into Cart values ('beer','red',2)



select * into CartPivot  from Cart
pivot
(
    sum(Nr)
    for Color in ([blue],[black],[white],[red])
) PivotTable



select * from CartPivot


select Product, Nr, details from CartPivot
Unpivot
(
  Nr for details in  ([blue],[black],[white],[red])
) as UnPvt