Question

We have the following data.

TestName  Stage1  Stage2  Stage3  Stage4
Test1     John    Calra   John    Calre
Test2     Calra   null    John    Calra

We need to implement a query which show data in below format.

User    Stage1count  Stages2Count  Stages3count  Stages4Count
John         1             0             2             0
Calra        1             1             0             2

Thanks
John

Answer 1

You could use a union to normalize the data. After that, a regular pivot strategy will work:

select  Name
,       sum(case when Stage = 1 then 1 end) as Stage1count
,       sum(case when Stage = 2 then 1 end) as Stage2count
,       sum(case when Stage = 3 then 1 end) as Stage3count
,       sum(case when Stage = 4 then 1 end) as Stage4count
from    (
        select  1 as Stage
        ,       Stage1 as Name
        from    YourTable
        union all
        select  2 as Stage
        ,       Stage2 as Name
        from    YourTable
        union all
        select  3 as Stage
        ,       Stage3 as Name
        from    YourTable
        union all
        select  4 as Stage
        ,       Stage4 as Name
        from    YourTable
        ) as SubQueryAlias
group by
        Name