Pad user input with zeros in a multiple value parameter - reporting-services

Question

Is there a way to pad numbers in a multiple value parameter to make them have 8 characters in length? Right now I am using:
=Right("00000000" & Parameters!Accounts.Value,8)
in an invisible parameter then that parameter is passed to the in part of my query. When I have, multiple values unchecked it works properly, but as soon as I turn on multiple values I get an error
The DefaultValue expression for the report parameter ‘ActualAccounts’ contains an error: Operator ‘&’ is not defined for string “00000000” and type ‘Object()’.”
I want the user to be able to paste in a list of accounts like:
93874
93932128
3838
And then it queries the database as
00093874
93932128
00003838

Answer 1

Here is an approach that could work for you.
First, grab the udf_Split user-defined function (UDF) from the this question's answer. With this UDF you to pass the delimited string as a parameter, and it will return a table with a row for each value. This is how SSRS sends the data to SQL Server when it comes to multi value parameters.
Once you have that in place, then all you need to do is use that UDF in the following manner.
DECLARE #ActualAccounts varchar(100) = '93874,93932128,3838'
SELECT RIGHT('00000000' + RTRIM(LTRIM(Value)), 8) AS Accounts
FROM dbo.udf_Split(#ActualAccounts, ',');
Results:
Accounts
--------
00093874
93932128
00003838
Then you could use this in the SQL for the report
SELECT *
FROM Accounts
WHERE AccountNumber IN (SELECT RIGHT('00000000' + RTRIM(LTRIM(Value)), 8)
FROM dbo.udf_Split(#ActualAccounts, ','));
This answer assumes the name of the SSRS parameter is ActualAccounts. You should be able to fit this into a stored procedure, if that is what you are using. It should work in straight SQL if you have that embedded in the RDL, too.
Hope this helps out.