Each presentation object can have a list of aliases (synonyms) for its name that you can use in Logical SQL queries.
Use the Alias tab in the Properties dialog for the appropriate presentation object such as subject area, presentation table, presentation hierarchy, presentation level, or presentation column to create the list of aliases.
Because Presentation layer objects are often deleted and then re-created during the repository development process, it is best to wait until your logical business model is relatively stable before creating aliases for presentation objects.
You can use this feature to rename presentation objects without breaking references that any existing requests have to the old names, including requests from Answers, Oracle BI Publisher, or other Logical SQL clients. If you are still developing a new repository, you might want to wait until the repository is stable before renaming objects.
For example, consider a subject area called Sample Sales Reduced that contains a presentation table called Facts Other. If you rename the presentation column called # of Customers to Number of Customers, any requests that use # of Customers fail. However, if you add # of Customers to the list of synonyms in the Alias tab for the Number of Customers column, then queries containing both # of Customers and Number of Customers succeed and return the same results.
Aliases for presentation objects do not appear in Answers or other query clients when creating new queries. Only the primary names of subject areas, hierarchies, levels, tables, and columns appear.
This feature works in a different way from SQL aliases or the alias feature in the Physical layer. It simply provides synonyms for object names, much like synonyms in SQL.
Aliases are created automatically when you rename presentation objects. For example, if you change Catalog to Catalog1, the original name Catalog is added to the Aliases list.
You cannot rename a Presentation layer object to a name that is already in use as an alias for an object of the same type.