Question

please consider data:

 Id          Group            Value
 -----------------------------------
 1            1                10
 2            1                12
 3            1                10
 4            2                90
 5            2                10
 6            3                30
 7            4                12
 8            4                11
 9            5                10
 10           5                11

I want to do Group By on this data as 1,2,3 place in one group and 4,5 place in another group. How I can do this with SQL Server?

thanks

---

Edit 1)

I want this result:

Groups                              Count
-----------------------------------------
Group for 1,2,3                       6
Group for 4,5                         4

Answer 1

I’m using outer apply so you will not duplicate your code to group

select
    C.Group_Name, count(*)
from Table1
    outer apply
    (
        select
            case
                when C.[Group] in (1, 2, 3) then 'Group for 1, 2, 3'
                when C.[Group] in (4, 5) then 'Group for 4, 5'
            end as Group_Name
    ) as C
group by C.Group_Name

you can also use subquery

select
    C.Group_Name, count(*)
from 
(
    select
        case
            when T.[Group] in (1, 2, 3) then 'Group for 1, 2, 3'
            when T.[Group] in (4, 5) then 'Group for 4, 5'
        end as Group_Name,
        T.Value,
        T.Id
    from Table1 as T
) as C
group by C.Group_Name