vb.net barcode generator source code Lesson 2: Making Implicit Constraints Explicit in Visual Basic .NET

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Lesson 2: Making Implicit Constraints Explicit
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Lesson Review
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You can use the following questions to test your knowledge of the information in Lesson 2, Making Implicit Constraints Explicit. The questions are also available on the companion CD if you prefer to review them in electronic form.
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Answers
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Answers to these questions and explanations of why each answer choice is correct or incorrect are located in the Answers section at the end of this book.
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1. You want to ensure that no contractor can enter more than 60 hours in the Weekly_Hours column of the Worksheet table. Which of the following constraints would you apply A. UNIQUE B. FOREIGN KEY C. PRIMARY KEY D. CHECK 2. You want to ensure that a value of 0 is entered in the Hours column of the Worksheet table if no other value is specified. Which of the following technologies would you use to achieve this goal A. Nullability B. CHECK constraint C. DEFAULT definition D. FOREIGN KEY constraint 3. You want to ensure that only names from an approved list of 500 contractors located in the Contractors table can be typed in the Contractor_Name column of the Worksheet table. Which technology will you use to achieve this goal A. FOREIGN KEY constraint B. UNIQUE constraint C. INSTEAD OF trigger D. AFTER trigger
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Design Data Integrity
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Lesson 3: Assigning Data Types to Control Characteristics of Data Stored in a Column
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The characteristics of how SQL Server stores data within a column, especially numerical data, can be extremely important. In engineering and scientific applications, the precision of a measurement can be critical. There is a big difference in knowing whether a value is accurate to a millimeter or one-tenth of a millimeter. If you do not configure data types correctly, SQL Server might alter data stored in a database to appear less or more precise than it actually is. A column in a table that automatically rounds off a decimal place on entered data might cause serious problems and even require that all measurements be taken again.
After this lesson, you will be able to:
Assign the Transact-SQL data types to control characteristics of data stored in a column. Use Alias data types to ensure that columns share the same length, type, and nullability.
Estimated lesson time: 30 minutes
Transact-SQL Data Types
Sometimes ensuring data integrity can be as simple as ensuring that the appropriate column is assigned one of the existing Transact-SQL data types. If you want to make sure that users can insert only numbers, and not text, in a column used for storing phone numbers, you should make sure that the column uses the int data type rather than the varchar data type. There are 28 base Transact-SQL Data types available in SQL Server 2005. These data types are detailed in Table 8-1.
Table 8-1
Description of Transact-SQL Data Types
Data Type bigint int smallint tinyint bit decimal
Description Integer between 2^63 and (2^63) 1. Integer between 2^31 and (2^31) 1. Integer between 2^15 and (2^15) 1. 0 to 255. 0, 1, or NULL. A total of 38 digits can be stored on both the left-hand and righthand sides of the decimal point.
Lesson 3: Assigning Data Types to Control Characteristics of Data Stored in a Column
Table 8-1
Description of Transact-SQL Data Types
Data Type numeric money smallmoney float real datetime smalldatetime char varchar text nchar nvarchar ntext binary varbinary
Description Functionally equivalent to decimal. 922,337,203,685,477.5808 to 922,337,203,685,477.5807. 214,748.3648 to 214,748.3647. Floating point numeric data in the ranges of 1.79E+308 to 2.23E 308, 0 and 2.23E 308 to 1.79E+308. Floating point numeric data in the ranges of 3.40E + 38 to 1.18E 38, 0 and 1.18E 38 to 3.40E + 38. January 1, 1753 through December 31, 9999. 3.33 millisecond accuracy. January 1, 1900 through June 6, 2079. One-minute accuracy. Fixed-length, non-Unicode character data with length of n bytes, where n is a value from 1 to 8000. Variable-length, non-Unicode character data with length of n bytes, where n is a value from 1 to 8000. Variable-length, non-Unicode data in the code page of the server with a maximum length of 2^31 1 (2,147,483,647) characters. Fixed-length, Unicode character data of n characters. n must be a value from 1 through 4000. Variable-length Unicode character data. n can be a value from 1 through 4000. Variable-length Unicode data with a maximum length of 2^30 1 (1,073,741,823) characters. Fixed-length binary data with a length of n bytes, where n is a value from 1 through 8000. Variable-length binary data with a length of n bytes, where n is a value from 1 through 8000.
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