How to add an additional column to the result set returned by a SP without modifying the SP? - sql

Question

I have a Stored Procedure (SP), named myStoredProcedure, returning me such output based on startDate and endDate user-defined parameters:
PrimaryName SecondaryName Volume
A B 20
C D 30
A D 50
...
So, Volume represents the sum of all the cases between the dates defined.
In another SP, named mySecondStoredProcedure, I am using the first SP to get the result there. However, my problem is that I need an additional attribute in my output, which is year, I want to see year based volumes. Therefore, the output I would like to see is something like that
assume startDate: 2014, endDate: 2015:
PrimaryName SecondaryName Volume Year
A B 12 2014
C D 14 2014
A D 20 2014
A B 8 2015
C D 16 2015
A D 30 2015
...
I am not allowed to modify myStoredProcedure. Therefore I build a while loop in the second SP to receive it. My code is like:
declare #temp_table table
(
PrimaryGroup varchar(10),
SecondaryGroup varchar(10),
Volume int
)
while #startDate < #endDate
begin
insert into #temp_table
exec myStoredProcedure #startDate #endDate
set #startDate = DATEADD(YEAR,1,#startDate)
end
select * from #temp_table
This is giving me the result without the year column. I need a year column like I showed in my example output above. I could not find a way to add it. There is no primary key in the result set returned by myStoredProcedure. Also, SQL Server 2008 does not let me add a year column in #temp_table, saying that fields are not matching. How can I add the year column properly? Any help would be appreciated!
EDIT: When I add year column in the definition of #temp_table, the error I receive: Column name or number of supplied values does not match table definition.

Answer 1

You're close with the syntax you currently have, you'll just need to add the year to the temp table and supply it after calling the stored procedure. In addition, you will also need to specify the columns being inserted (a practice well worth getting in the habit of) as your procedure doesn't return the same number of columns.
declare #temp_table table
(
PrimaryGroup varchar(10),
SecondaryGroup varchar(10),
Volume int,
Year int
)
while #startDate < #endDate
begin
insert into #temp_table (PrimaryGroup, SecondaryGroup, Volume)
exec myStoredProcedure #startDate #endDate
Update #temp_table
Set Year = #StartDate
Where Year Is Null
set #startDate = DATEADD(YEAR,1,#startDate)
end
select * from #temp_table

Answer 2

Add a Year column to your temp table, and apply the structured insert
declare #temp_table table
(
PrimaryGroup varchar(10),
SecondaryGroup varchar(10),
Volume int,
Year int
)
while #startDate < #endDate
begin
insert into #temp_table (PrimaryName,SecondaryName,Volume)
exec myStoredProcedure #startDate #endDate
Update #temp_table set Year = #startDate where Year is Null
set #startDate = DATEADD(YEAR,1,#startDate)
end
select * from #temp

Answer 3

Create a second table variable that will hold the result:
declare #result_table table
(
Year int,
PrimaryGroup varchar(10),
SecondaryGroup varchar(10),
Volume int
)
Then in the while loop after fetching the result into #temp_table:
insert into #result_table
select <year>, PrimaryGroup, SecondaryGroup, Volume from #temp_table;
truncate #temp_table;