SSRS DataSet different fields dependant on parameter - tsql

Question

I am supplying a dataset to my SSRS report using a stored proc. Within my stored proc is a parameter called #ReportType. I use this as I have two reports which use the same subset of data however they return different columns based on the #ReportType and in one the report types I aggregate the data.
So for example the end of my stored proc is as follows:
---Income
IF #Rpt_Type = 'Income'
BEGIN
SELECT
EXPENSE_TYPE
, ACCOUNT_NAME
, CURRENCY
, SETTLEMENT_DATE
, ISSUE
, ISSUE_DESCRIPTION
, SETTLEMENT_AMOUNT
, TRANSACTION_STATUS
, TRANSACTION_CATEGORY
, TRANSACTION_SUBCATEGORY
, TRANSACTION_DESCRIPTION
FROM #RESULT_SET
WHERE TRANSACTION_CATEGORY IN ('IN','IF') OR (TRANSACTION_CATEGORY IN ('CD','CW') AND TRANSACTION_SUBCATEGORY IN ('INT','SLI','RDS','INS','INC'))
ORDER BY expense_type,settlement_date,issue_description
END
---Expenses
IF #Rpt_Type = 'Expenses'
BEGIN
BEGIN
SELECT
ACCOUNT_NAME AS [Portfolio_Number]
, TRANSACTION_SUBCATEGORY AS [Cash_flow_type]
, TRANSACTION_DESCRIPTION AS [Cash_Flow_Description]
, COUNT(ACCOUNT_NAME) AS [Number Of Transactions]
, #ReportEndDate AS [EndDate]
FROM #RESULT_SET
WHERE TRANSACTION_SUBCATEGORY IN ('CCD','CCW','FSB','FSS','FFB','FFS','FSO','FSC','FFO','FFC')
AND INQ_BASIS_NUM = '1'
GROUP BY ACCOUNT_NAME,TRANSACTION_SUBCATEGORY,TRANSACTION_DESCRIPTION,TRANSACTION_CATEGORY
ORDER BY ACCOUNT_NAME,TRANSACTION_SUBCATEGORY,TRANSACTION_DESCRIPTION,TRANSACTION_CATEGORY
END
My question is how can I get SSRS to return the different columns for each report type? Is there a way in how I create the dataset that I can give the parameter before the columns are returned into SSRS for me to use? Will I have to create two datasets in SSRS to cater for the different columns required?

Answer 1

This will work so long as you return the same column names for each #Rpt_Type. For #Rpt_Type 'Income', return NULL values for the #Rpt_Type 'Expenses' data, and vice versa. Otherwise, the report will expect columns that it isn't getting from the dataset and the dataset will fail:
---Income
IF #Rpt_Type = 'Income'
BEGIN
SELECT
EXPENSE_TYPE
, ACCOUNT_NAME
, CURRENCY
, SETTLEMENT_DATE
, ISSUE
, ISSUE_DESCRIPTION
, SETTLEMENT_AMOUNT
, TRANSACTION_STATUS
, TRANSACTION_CATEGORY
, TRANSACTION_SUBCATEGORY
, TRANSACTION_DESCRIPTION
, NULL Portfolio_Number
, NULL Cash_flow_type
, NULL Cash_Flow_Description
, NULL [Number Of Transactions]
, NULL EndDate
FROM #RESULT_SET
WHERE TRANSACTION_CATEGORY IN ('IN','IF') OR (TRANSACTION_CATEGORY IN ('CD','CW') AND TRANSACTION_SUBCATEGORY IN ('INT','SLI','RDS','INS','INC'))
ORDER BY expense_type,settlement_date,issue_description
END
---Expenses
IF #Rpt_Type = 'Expenses'
BEGIN
BEGIN
SELECT NULL EXPENSE_TYPE
, NULL ACCOUNT_NAME
, NULL CURRENCY
, NULL SETTLEMENT_DATE
, NULL ISSUE
, NULL ISSUE_DESCRIPTION
, NULL SETTLEMENT_AMOUNT
, NULL TRANSACTION_STATUS
, NULL TRANSACTION_CATEGORY
, NULL TRANSACTION_SUBCATEGORY
, NULL TRANSACTION_DESCRIPTION
, ACCOUNT_NAME AS [Portfolio_Number]
, TRANSACTION_SUBCATEGORY AS [Cash_flow_type]
, TRANSACTION_DESCRIPTION AS [Cash_Flow_Description]
, COUNT(ACCOUNT_NAME) AS [Number Of Transactions]
, #ReportEndDate AS [EndDate]
FROM #RESULT_SET
WHERE TRANSACTION_SUBCATEGORY IN ('CCD','CCW','FSB','FSS','FFB','FFS','FSO','FSC','FFO','FFC')
AND INQ_BASIS_NUM = '1'
GROUP BY ACCOUNT_NAME,TRANSACTION_SUBCATEGORY,TRANSACTION_DESCRIPTION,TRANSACTION_CATEGORY
ORDER BY ACCOUNT_NAME,TRANSACTION_SUBCATEGORY,TRANSACTION_DESCRIPTION,TRANSACTION_CATEGORY
END