Question

Based on following AreaState table

Area    State
-------------------
A1  Active
A1  Active
A1  Active
A1  Proposed
A1  Proposed
A2  Active
A2  Proposed

I want to write a stored proc that returns count of state for each of the areas. Input to the stored proc is any valid State (in this case @state is the input parameter). I was hoping that below would work but it does not.

declare @state varchar(10)
set @state = 'Active'

select Area, QUOTENAME(@state)
from
(
  select Area, State from AreaState
) as src
pivot
(
   count(State) for State in (QUOTENAME(@state))
) as pvt

Pls. suggest.

Answer 1

I am not sure if this is the best approach but it does solve the issue.

declare @state varchar(20)
set @state = 'Proposed'

create table #tt_Result
(
  Area varchar(max),
  [Active] int,
  [Proposed] int
)

insert into #tt_Result
select Area, [Active], [Proposed]
from
(
  select Area, State from AreaState
) as src
pivot
(
   count(State) for State in ([Active], [Proposed])
) as pvt

select Area, 
case
  when @state = 'Active' then [Active]
  when @state = 'Proposed' then [Proposed]
end as [Count]
from #tt_Result

drop table #tt_Result