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

Passing Multiple Values to a Multi-Select Parameter in SSRS via Web Query String

This article demonstrates two approaches to passing multiple values to a single multi-select parameter in SQL Server Reporting Services (SSRS) using a web query string.

Method 1: Direct Parameter Joining

This method directly uses the SSRS parameter values within the report's query.

1. SSRS Report Parameter: In the report's parameter definition, set the parameter's default value to: =Join(Parameters!<YourParameterName>.Value,",") Replace <YourParameterName> with the actual name of your multi-select parameter. This concatenates the selected values into a comma-separated string.

2. SQL Query: In your dataset query, use the IN operator to check against the comma-separated string: WHERE YourColumn IN (@<YourParameterName>)

Method 2: Using a User-Defined Function (UDF) (Less Efficient)

This approach involves creating a scalar-valued UDF to handle the string concatenation. However, due to potential performance issues, this method is generally less recommended than Method 1.

Example Query (Method 1):

The provided example query is complex and might not be directly applicable to all scenarios. A simpler illustrative example is more beneficial:

Let's assume you have a table named Products with columns ProductID and ProductName, and a multi-select parameter named ProductIDParameter in your SSRS report.

A simplified query using Method 1 would be:

SELECT ProductID, ProductName
FROM Products
WHERE ProductID IN (@ProductIDParameter)

This query directly utilizes the comma-separated string passed from the SSRS parameter.

Remember to adjust <YourParameterName> and YourColumn to match your specific report and database schema. Method 1 provides a cleaner and more efficient solution for passing multiple values to a multi-select parameter in SSRS through a web query string.

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