How to Efficiently Pass Array Parameters to Reporting Services Web Queries?

Streamlining Array Parameter Passing in Reporting Services Web Queries

Reporting Services queries often require parameters, especially multi-select parameters allowing users to choose multiple values. While passing single values is simple, handling arrays via web query strings presents a challenge.

While a common solution involves a scalar-valued user-defined function (UDF) to parse comma-separated values into an array (as suggested by John Sansom), this adds processing overhead. A more efficient alternative avoids UDFs entirely:

1. In your SSRS report, locate the query's parameter tab.
2. Assign the parameter value this expression:

<code>=Join(Parameters!<your parameter name>.Value,",")</code>

This concatenates selected values into a comma-separated string for the query.

3. In your query, reference the parameter like this:

<code>WHERE yourColumn IN (@<your parameter name>)</code>

This treats the parameter as an array, enabling filtering based on multiple selections.

This method directly passes an array of values to your multi-select parameter without needing UDFs, leading to a more efficient and cleaner web query string.

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