A filter limits the information Cognos will retrieve for your report.
In general, you should always filter your report to ensure that it contains exactly the information you need. Often, you will want need many filters. Information must match all filters for it to appear on your report.
Group Filter: Applies a filter to groups in the report. Generally appears in the query of query explorer.
You can filter information at a higher level by using the Group Filters tab in the Filters window. When you apply a group filter to a report item say, Product type, product types that do not fit your specification are filtered out when you run the report.
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