TAILIEUCHUNG - The Creating Views

After completing this lesson, you should be able to do the following: Describe a view Create, alter the definition of, and drop a view Retrieve data through a view Insert, update, and delete data through a view Create and use an inline view Perform “Top-N” analysis | Creating Views Schedule: Timing Topic 20 minutes Lecture 20 minutes Practice 40 minutes Total Objectives After completing this lesson, you should be able to do the following: Describe a view Create, alter the definition of, and drop a view Retrieve data through a view Insert, update, and delete data through a view Create and use an inline view Perform “Top-N” analysis Lesson Aim In this lesson, you learn how to create and use views. You also learn to query the relevant data dictionary object to retrieve information about views. Finally, you learn to create and use inline views, and perform Top-N analysis using inline views. Database Objects Description Basic unit of storage; composed of rows and columns Logically represents subsets of data from one or more tables Generates primary key values Improves the performance of some queries Alternative name for an object Object Table View Sequence Index Synonym What is a View? EMPLOYEES Table: What Is a View? You can present .

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