3: Database Design in .NET

Painting QR-Code in .NET 3: Database Design

3: Database Design
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Figure 3-33 The database diagram of the Tester database
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If the answer to all these questions is yes, great job! I bet you ve done this before If the answer to any of the preceding questions is no, tweak your design a little bit until it does meet these requirements If this is the first time you ve done this, don t expect it to be perfect on the first try The first time I did a summersault, it wasn t a pretty picture However, after years of practice, I could finally roll over as well as anyone It would have been foolish of me to think I could have done a perfect summersault the first time I tried Likewise, the first time you try to design a database, it probably won t be perfect No problem Just tweak a little here and there, and eventually you ll have a workable design You ll probably master it more quickly than I mastered summersaults The following is the script to create this database:
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USE Master; GO CREATE DATABASE Tester; GO USE Tester GO CREATE TABLE dboRoles ( RoleID int NOT NULL, RoleName varchar(15) NULL, CONSTRAINT PK_RoleID PRIMARY KEY (RoleID) )
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MCITP SQL Server 2005 Database Developer All-in-One Exam Guide
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GO CREATE TABLE dboPerson ( PersonID int NOT NULL, LastName varchar(15) NULL, FirstName varchar(15) NULL, RoleID int NULL CONSTRAINT PK_PersonID PRIMARY KEY (PersonID) ) GO CREATE TABLE dboPersonRoles ( PersonID int NOT NULL references dboPerson, RoleID int NOT NULL references dboRoles, CONSTRAINT PK_PersonIDRoleID PRIMARY KEY (PersonID, RoleID) ) GO CREATE TABLE dboCategory ( CategoryID int NOT NULL, Category varchar(30) NULL, CONSTRAINT PK_CategoryID PRIMARY KEY (CategoryID) ) GO CREATE TABLE dboTests ( TestID int NOT NULL, TestName varchar(30) NULL, CategoryID int NULL references dboCategory CONSTRAINT PK_TestID PRIMARY KEY (TestID) ) GO CREATE TABLE dboQuestion ( QuestionID int NOT NULL, QuestionText varchar(200) NULL, Explanation varchar(300) NULL, Reference varchar(200) NULL, TestID int NULL references dboTests CONSTRAINT PK_QuestionID PRIMARY KEY (QuestionID) ) GO CREATE TABLE dboAnswer ( AnswerID int NOT NULL, AnswerText varchar(100) NULL, CorrectAnswer bit NULL, QuestionID int NOT NULL references dboQuestion CONSTRAINT PK_AnswerID PRIMARY KEY (AnswerID) ) GO CREATE TABLE dboTestHistory ( TestHistoryID int NOT NULL, PersonID int NULL references dboPerson, TestID int NULL references dboTests, DateTaken datetime NULL, Score decimal(4,2) NULL CONSTRAINT PK_TestHistoryID PRIMARY KEY (TestHistoryID) )
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3: Database Design
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Review
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With this chapter under your belt, you should have a good understanding of PRIMARY and FOREIGN KEYs and how they re used to create relationships between tables We covered the different types of relationships (one-to-many, many-to-many, and one-toone), normalization and how multiple tables are created to eliminate redundancy, and how occasionally databases are denormalized by adding redundancy We covered other types of constraints such as CHECKs and defaults and when to implement them Very large tables of millions of rows can be partitioned We covered the traditional horizontal partitioning tables and federations, and the new feature of implementing partition schemes Lastly, we tied the chapter together with an exercise creating a database
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Additional Study
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Self Study Exercises Use these additional exercises to challenge yourself: Create a database named Ch3Ex Create three tables named Books, Authors, and BookAuthors Decide on the appropriate columns for each and create the appropriate relationships Ensure you finish with a many-to-many relationship between the Books and Authors tables If not created already, add a Phone column to the Authors table and create a CHECK constraint to ensure the phone is entered in the following format: xxxxxxxxxx BOL Topics PRIMARY KEY Constraints FOREIGN KEY Constraints AdventureWorks Data Dictionary ALTER TABLE (Transact-SQL) CHECK Constraints Functions (Database Engine) CREATE PARTITION SCHEME (Transact-SQL) Designing Partitions to Manage Subsets of Data
Summary of What You Need to Know
70-431 When preparing for the 70-431 test, make sure you understand the topics in all the main sections of this chapter Spend extra time as needed to ensure you understand these topics: CHECK Constraints Partitioning Tables
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