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Siebel Analytics Server Administration Guide > Creating and Administering the Business Model and Mapping Layer in a Repository > Creating and Administering Logical Columns > Setting Default Levels of Aggregation for Measure ColumnsYou need to specify aggregation rules for mapped logical columns that are measures. Aggregation should only be performed on measure columns. Measure columns should exist only in logical fact tables. You can specify an override aggregation expression for specific logical table sources. This helps the Analytics Server take advantage of aggregate tables when the default aggregation rule is Count Distinct. If you do not specify any override, then the default rule prevails. To specify a default aggregation rule for a measure column
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Siebel Analytics Server Administration Guide |