Force.com Platform Fundamentals

Preface
Introducing the Force.com Platform
About the Sample Recruiting App
Reviewing Database Concepts
Building a Simple App
Enhancing the Simple App with Advanced Fields, Data Validation, and Page Layouts
Expanding the Simple App Using Relationships
Introducing Relationships
Introducing Relationship Custom Fields
Adding Candidates to the Mix
Bringing Candidates and Positions Together with Job Applications
Introducing Search Layouts
Managing Review Assessments
Try It Out: Create the Review Object
Try It Out: Add Fields to the Review Object
Introducing Roll-Up Summary Fields
Try It Out: Create Roll-Up Summary Fields
Try It Out: Customize the Review Object's Page and Search Layouts
Try It Out: Customize Record Highlights for Reviews
Look at What We've Done
Creating a Many-to-Many Relationship
Putting it All Together
Securing and Sharing Data
Collaborating with Chatter
Using Custom Workflow and Approval Processes
Analyzing Data with Reports and Dashboards
Moving Beyond Point-and-Click App Development
Learning More
Glossary
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Introducing Roll-Up Summary Fields

The rating system we created on the Review object lets users quickly see each reviewer's opinion of the candidate's suitability for the position. While each individual opinion is important, it would be even better to see these ratings compiled in a way that summarizes how the candidate did overall. For example, wouldn't it be great if we could have a Total Rating field on each Job Application record that shows the sum of all the job application's review ratings?

The good news is that we can! A simple roll-up summary field on the Job Application object can summarize data from a set of related detail records and automatically display the output on a master record. Use roll-up summary fields to display the sum, minimum, or maximum value of a field in a related list, or the record count of all records listed in a related list.