A parameterized report uses input values to complete report or data processing. With a parameterized report, you can vary the output of a report based on values that are set when the report runs. Parameterized reports are frequently used for drillthrough and subreports, connecting reports with related data.
Parameters are used in dataset queries to select report data, to filter the result set that the query returns, or to set layout properties used for showing and hiding parts of a report. You can also specify cascading parameters that populate a series of dependent, drop-down parameter lists. For example, a drop-down list of Region parameter values can be used to populate a drop-down list of City parameter values.
You can use parameters with linked reports by pairing a specific parameter with each linked report to change the outcome. For example, you can create a single regional sales report that shows the sales for all regions, and then use a parameter for each linked report to filter data for a particular region. Specific parameter values can be stored with the report so that users do not have to type values. For more information about linked reports, see Linked Reports.
Not all parameters may be visible in the report at run time. A report author, report server administrator, or content manager can specify which values to use and then hide the input fields on the report.
Query Parameters and Report Parameters
Reporting Services supports two kinds of parameters: query parameters and report parameters. Query parameters are used during data processing to select or filter data. Query parameters are specified in the syntax of a data processing extension. If a query parameter is specified, a value must be provided either by the user or by default properties to complete the SELECT statement or stored procedure that retrieves data for a report. Report parameters are used during report processing to show a different aspect of the data. A report parameter is usually used to filter a large set of records, but it can have other uses depending on the queries and expressions used in the report. Report parameters differ from query parameters in that they are defined in a report and processed by the report server, while query parameters are defined as part of the dataset query and processed on the database server. For more information, see Working with Parameters in Reporting Services.
17 July 2006