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Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenario. This scenario sets up a real-world situation involving the topics of this chapter and asks you to create solutions. Complete the suggested practices. Take a practice test.
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Always consider which data types you are using because changing your mind later can be more difficult than you think. Consider using user-defined data types to simplify selecting the correct data type when creating tables and to avoid data type mismatches in your database. Having appropriate names, as defined in a naming guidelines document for objects and columns, is very important to make sure that the naming in your database is consistent. Consider compressing large tables to save disk space and memory, as well as possibly increasing performance. Implement constraints to verify data integrity. Implement constraints to support the optimizer. Consider using UDFs in check constraints to implement advanced data integrity.
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Constraint Primary key Unique constraint Foreign key constraint Check constraint Identity
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In the following case scenario, you apply what you have learned about in this chapter. You can find answers to these questions in the Answers section at the end of this book.
Case Scenario: Constraints and Data Types
You are a database developer for Contoso Corporation. You have been given the responsibility to add both check and foreign key constraints to the Products table, which contains a large amount of incorrect data. You need to add the constraints to the table to prevent any more incorrect data from being inserted or updated in the table. You also need to create a new table named ProductLog, which will use an identity column as its primary key and which will contain a huge number of rows. For this reason, you must choose the largest data type that is supported by the IDENTITY property for this column. Answer the following questions for your manager:
1. 2.
How should you add the constraints to the Products table Which data type should you use for the ProductLog table
Suggested Practices
To help you master the exam objectives presented in this chapter, do all the following practices:
Create and Alter Tables
Practice 1
Create the tables needed to store information about your DVD collection.
Implement Data Types
Practice 2 Create all alias types (user-defined data types) needed by the columns defined in Practice 1.
Manage International Considerations
Practice 3 Change the tables defined in Practice 1 to use the alias types that you created in Practice 2.
Create and Modify Constraints
Practice 4 Implement referential integrity on the tables that you defined in Practice 1 using primary key and foreign key constraints.
Implement any check and unique constraints that you think are appropriate to verify the data integrity in the tables defined in Practice 1.
Practice 5
Tables, Data Types, and Declarative Data Integrity
take a Practice test
The practice tests on this book s companion CD offer many options. For example, you can test yourself on just the content covered in this chapter, or you can test yourself on all the 70-433 certification exam content. You can set up the test so that it closely simulates the experience of taking a certification exam, or you can set it up in study mode so that you can look at the correct answers and explanations after you answer each question.
More info
PRactice teStS
For details about all the practice test options available, see the section entitled How to Use the Practice Tests, in the Introduction to this book.
Take a Practice Test
cHaPteR 4
Using Additional Query Techniques
ithin many applications you need to construct queries that go beyond a basic SELECT statement, such as creating running totals, finding gaps in sequences, traversing a recursive hierarchy, or ranking data within a set. In this chapter, you will learn how to extend the querying techniques that you have learned within this book to encompass subqueries, common table expressions (CTEs), and ranking functions.
Exam objectives in this chapter:
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Implement subqueries. Implement CTE (common table expression) queries. Apply ranking functions.
Lessons in this chapter:
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Lesson 1: Building Recursive Queries with CTEs Lesson 2: Implementing Subqueries Lesson 3: Applying Ranking Functions
127 133
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