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The Mapping Rules can be accessed from the ribbon or from the action links on the right panel of the comparison tab. By default data compare performs an exact match on the object names. However, you can choose to ignore certain prefix or postfix. For example, if you ignore the "dev_" prefix on the left schema and the "prod_" prefix on the right schema, a table named dev_employees on the left schema will be mapped to a table named prod_employees on the right schema.
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