Question

I have a table similar to below

Date   |field1  | qty1 | qty2 | qty3
1 Aug  | xyz    | 0    | 0    | 3
1 Aug  | xyz    | 3    | 0    | 0
1 Aug  | abc    | 0    | 5    | 0
2 Aug  | abc    | 0    | 15   | 0
2 Aug  | xyz    | 0    | 12   | 0
2 Aug  | xyz    | 5    | 0    | 0

I have written three stored procedures to display each quantity separately as below.

This is my first procedure

create procedure firstprocedure 
@startdate datetime, @enddate datetime
As
select date, sum (case when field1 = 'xyz', qty1) as XYZ,
sum (case when field1 = 'abc', qty1) as ABC 
from table1
where date between @startdate and @enddate
group by date

This is my second procedure

Create procedure secondprocedure
@startdate datetime, @enddate datetime
As
select date, sum (case when field1 = 'xyz', qty2) as XYZ,
sum (case when field1 = 'abc', qty2) as ABC 
from table1
where date between @startdate and @enddate
group by date

This is my third procedure

Create procedure thirdprocedure 
@startdate datetime, @enddate datetime
As
select date, sum (case when field1 = 'xyz', qty3) as XYZ,
sum (case when field1 = 'abc', qty3) as ABC 
from table1
where date between @startdate and @enddate
group by date

I wonder is there any chance I just place the columns(whether qty1, qty2, or qty3) in parameters and while executing just mention if I want qty1 or qty2 or qty3. It should produce output accordingly.

Answer 1

try this:

create a procedure like this:

create procedure my_procedure(@startdate datetime, @enddate datetime,@qty_type varchar(50))
as
begin 
    with cte as( 
    select 'qty1' [col_name],date, sum (case when field1 = 'xyz' then qty1 end) as XYZ,
    sum (case when field1 = 'abc' then qty1 end) as ABC 
    from table1
    where date between @startdate and @enddate
    group by date
    union all 
    select 'qty2' [col_name],date, sum (case when field1 = 'xyz' then qty2 end) as XYZ,
    sum (case when field1 = 'abc' then qty2 end) as ABC 
    from table1
    where date between @startdate and @enddate
    group by date
    union all
    select 'qty3' [col_name],date, sum (case when field1 = 'xyz' then qty3 end) as XYZ,
    sum (case when field1 = 'abc' then qty3 end) as ABC 
    from table1
    where date between @startdate and @enddate
    group by date
    )select * from cte where [col_name]=@qty_type
end

then execute it with:

exec '2012-04-01','2012-05-01','qty1'

or

exec '2012-04-01','2012-05-01','qty2'