How Can I Pass Multiple Values to a Single Reporting Services Parameter via a Web Query String?

Handling Multiple Parameter Values in Reporting Services Web Queries

Reporting Services often requires handling multiple selections for a single parameter via web query strings. While passing a single value is straightforward, managing multiple values presents a challenge.

One solution involves a database scalar-valued user-defined function (UDF). This UDF would accept a comma-separated string of values and return a table with each value on a separate row. The report query could then utilize this UDF to process the input.

A more efficient approach, however, is to directly manipulate the parameter within SSRS. In the report's parameter tab, under the query definition, set the parameter value to:

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

Your query can then use this modified parameter:

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

This joins the selected parameter values into a single comma-separated string, enabling the transmission of multiple values through a single web query string parameter.

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