create qr code vb.net Part 4: Designing an Access Project in .NET

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Part 4: Designing an Access Project
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Microsoft Office Access 2003 Inside Out
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You should give your columns meaningful names and should use the same name throughout for a column that occurs in more than one table. You should avoid using column names that might also match any name internal to Microsoft Access, Visual Basic, or SQL Server. For example, all objects have a Name property, so it s a good idea to qualify a column containing a name. For example, use CustomerName, CompanyName, VendorName, or something similar. You should also avoid names that are the same as built-in functions, such as Date, Time, Now, or Space. You will see that if you type a column name that doesn t meet the Rules for Identifiers criteria, the name appears in delimited brackets ([ ]). Delimited means that the object name does not meet the criteria of the Rules for Identifiers naming convention. Delimited object names must always be encased in brackets ([ ]) or double quotes ( ). When names are delimited, SQL Server can still recognize and use them, but it must spend extra processing time converting those delimited names to limited names that meet the criteria for the Rules for Identifiers naming convention. Also, whenever you refer to objects with delimited names in forms, queries, or other procedures, you must continue to enclose them in brackets or double quotes. As you can see, you will have an easier time building your database and it will run more efficiently if you name all your objects using the Rules for Identifiers.
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Part 4: Designing an Access Project
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Column Data Types
Before you define all the columns for the Companies table, you need to understand the data types available in SQL Server. Table 17-1 describes all the data types supported by the Access project table design facility. For the most part, the listed data types are similar to the ones supported by an Access desktop database (.mdb). A table stored in SQL Server provides a much wider selection of data types than does an Access desktop database (.mdb). This allows you to be more exact in the amount of space that each column must consume, and thus gives you the opportunity to save space and processing time for your database.
Table 17-1.
SQL Server Data Types
Length (Bytes)
8 Fixed, up to 8000 1
Data Type
bigint binary bit
Description
Fixed-point integer from 263 to +263 1 Fixed-length binary data
Equivalent Desktop Database Data Type
(None) (None)
Yes/No True/false values. SQL Server can store up to eight columns of the bit data type in one byte. Non-Unicode (single-byte character set) fixed-length character values (None)
char
Fixed length, up to 8000
Part 1: Part Title
Building Tables in an Access Project
Table 17-1.
SQL Server Data Types
Length (Bytes)
Data Type
datetime
Description
Date/time value from January 1, 1753, to December 31, 9999, precise to 0.03 seconds
Equivalent Desktop Database Data Type
Date/Time
decimal
float
image int
16 plus length of the image 4
OLE Object data Fixed-point integer from 2,147,483,648 to +2,147,483,647 Currency data from -263 to +263 1, with four decimal places Unicode (double-byte character set) fixed-length character values Varying length Unicode character values
OLE Object Number (Long Integer)
money
Currency
nchar
Fixed, up to 8000 (4000 characters) 16 plus length of the text (maximum 1 billion characters)
(None)
ntext
Memo
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Part 4: Designing an Access Project
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Floating-precision numeric Number (Double) data from 1.79 10308 to +1.79 10308. Although you can define any precision from 1 to 53 bits in SQL Server, the table design facility in a project automatically sets precision to 53 (8 bytes) when you select float.
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5, 9, 13, or 17, depending on precision
An alias for numeric. Fixed- Number (Decimal) precision numeric data from 1038 to +1038. Precision (the number of digits) can be up to 38, and Scale (the number of digits to the right of the decimal point) can be as large as the specified precision.
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Part 00: Part Title
Microsoft Office Access 2003 Inside Out
Table 17-1.
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SQL Server Data Types
Length (Bytes)
Data Type
numeric
Description
Equivalent Desktop Database Data Type
An alias for decimal. Fixed- Number (Decimal) precision numeric data from 1038 to +1038. Precision (the number of digits) can be up to 38, and Scale (the number of digits to the right of the decimal point) can be as large as the specified precision. Varying length Unicode character values Text
nvarchar real
Varying, up to 8000 (4000 characters) 4
Number (Single) Floating-precision numeric data from 3.4 1038 to +3.4 1038. Although you can define any precision from 1 to 53 bits in SQL Server, the table design facility in a project automatically sets precision to 24 (4 bytes) when you select real. Date/time value from January 1, 1900, through June 6, 2079, precise to one minute Fixed-point integer from 32,768 to +32,767 Currency data from 214,748.3648 to +214,748.3647, with four decimal places (None)
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