Salesforce reporting - A joined report "lets you view different types of information in a single report."[1] They allow you to join up to five objects together in one report.[1]

A joined report "lets you view different types of information in a single report."[1] They allow you to join up to five objects together in one report. [1] http://login.salesforce.com/help/doc/en/reports_joined_format_overview.htm
Attribution to: Mike Chale
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