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Siebel Business Analytics Server Administration Guide > Creating and Administering the Business Model and Mapping Layer in a Repository >
Creating and Administering Logical Columns
Many logical columns are automatically created by dragging tables from the Physical layer to the Business Model and Mapping layer. Other logical columns, especially ones that involve calculations based on other logical columns, can be created later. Logical columns are displayed in a tree structure expanded out from the logical table to which they belong. If the column is a primary key column or participates in a primary key, the column is displayed with the key icon. If the column has an aggregation rule, it is displayed with a sigma icon. You can reorder logical columns in the Business Model and Mapping layer. This section includes the following topics:
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