Passing multiple values for a single parameter in Reporting Services

I have several Multi-Select parameters in my report. I am trying to find a way to pass in multiple values for a single parameter in the web query string? If I pass in a single value, it works fine.

The report runs fine selecting multiple choices for a single param. My trouble lies in the web query string.

Answer

Although John Sansom’s solution works, there’s another way to do this, without having to use a potentially inefficient scalar valued UDF. In the SSRS report, on the parameters tab of the query definition, set the parameter value to

=join(Parameters!<your param name>.Value,",")

In your query, you can then reference the value like so:

where yourColumn in (@<your param name>)