How do I select the result value of a case expression

Hello,

This is for an SSRS report and I'm not sure if what I'm trying to accomplish should be done in the SQL Query itself or somewhere in my Reporting Services report.

I have two separate agencies: ABC and DEF. Each agency has a bunch of sub-agencies defined my state. So in my database I would have:

ABC - NY
ABC - TX
ABC - MA
DEF - NY
DEF - PA
etc.

Transactions are coded to the individual agencies as displayed above. But my end users want the option to select either ABC or DEF or both (Select All). On the selection parameter they do not want to see it broken out to the sub-agencies. I have tried accomplishing this by setting up a second dataset and using select distinct with a case expression, but it returned no data when I ran my report.

Does anyone know how to do what I'm trying to accomplish?

Thanks!
erp1022Asked:
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joeviCommented:
Ideally you'd feed the parameter (@Agency) with a query (including an 'All' value). Use the query to feed a parameter listboxe in RS then create a dataset with some If..then logic (for the 'All' conditon). The rest is pretty much straight up TSQL.
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erp1022Author Commented:
More specific please. Not sure what a parameter listbox is or how to set one up. Not sure what the if...then logic should be or how to set that up. And 'the rest is pretty much straight up TSQL' - the rest of what? What needs to be done in SQL?
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joeviCommented:
Lets call your table 'Agencies' with Agency and SubAgency columns..
In BIDS:
1) Set up a Datasource pointing to the Agencies table.
2) Create Dataset1 using this query:
Select 'All' as Agency, 1 as SortOrder
UNION
Select Distinct Agency , 2 as SortOrder from Agencies
Order by SortOrder, Agency
3) Create a Parameter (lets call it @Agency) using the following properties:
Available Values-Get Values From Query, Datatset:Dataset1, Value Field:Agency, Label Field:Agency
4) Create Dataset2. I'd suggest passing the @Agency value to a stored procedure but for illustration purposes just paste the following into the Dataset2 Query
IF @Agency = 'All'
BEGIN
SELECT Agency, SubAgency FROM Agencies
END
ELSE
BEGIN
SELECT Agency, SubAgency FROM Agencies WHERE Agency = @Agency
END

Note: BIDS will complain about the query but for demo purposes it'll work.

5) Create a report table, add the appropriate columns and you should be good to go.
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erp1022Author Commented:
Great, thanks!
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