Monetary Data Types in .NET framework

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Monetary Data Types
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The money and smallmoney data types are a compromise between the precision of decimal numbers and the small size of real numbers. smallmoney occupies 4 bytes and uses the same internal structure as int numbers. The data can have up
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to four digits after the decimal point. For this reason, you can store numbers ranging from 214,768.3648 to 214,768.3647 in the smallmoney data type. The money data type uses the same structure for storing information as the bigint data type. It occupies 8 bytes for storage, so its values must range from 922,337,203,685,477.5808 to +922,337,203,685,477.5807. Monetary constants can be preceded by $ or one of 17 other currency symbols (listed in SQL Server Books Online):
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update Inventory_2 Set Rent = $0, LeaseCost = $119.95 Where InventoryId = 3432
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Binary data types are used to store strings of bits. SQL Server supports three basic binary data types, the attributes of which are similar to character data types: binary varbinary image The binary and varbinary data types can store up to 8000 bytes of information, and image can store up to 2GB of data. The following example creates a table that has two binary columns:
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CREATE TABLE MyTable ( Id int, BinData varbinary(8000), Diagram image) go
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Binary constants are written as hexadecimal representations of bit strings and prefixed with 0x (zero and x):
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Update MyTable Set BinData = 0x82A7210B where Id = 121131
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Special Data Types
The following sections cover the special data types.
SQL Server 2000 Stored Procedure & XML Programming
timestamp
The timestamp data type is not designed to store date or time information, but rather is a binary value that serves as a version number of the record. The value is updated every time the record is updated, and the value is unique in the database. It is used to implement optimistic locking. You can find more details about this subject in Optimistic Locking Using Timestamp Values 9. Only one field in a table can be defined as the timestamp value. It occupies 8 bytes.
uniqueidentifier
The uniqueidentifier data type stores 16-byte binary values. These values are often called globally unique identifiers (GUIDs). When a system generates a new GUID value, it is guaranteed that the same value cannot be produced again, neither on the same computer nor on any other computer in the world. GUIDs are generated using the identification number of the network card and a unique number obtained from the computer s clock. Manufacturers of network cards guarantee that the identification number of a network card will not be repeated in the next 100 years. A uniqueidentifier constant is usually presented as Character string '{BB7DF450-F119-11CD-8465-00AA00425D90}' Binary constant 0xaf16a66f7f8b31d3b41d30c04fc96f46 However, you will rarely type such values. In Transact-SQL, GUIDs should be generated using the NEWID function. There is also a Win32 API function that can produce a GUID value. uniqueidentifier values are used relatively often for implementations of web applications and distributed database systems. In web applications, designers might use the uniqueidentifier data type to generate a unique identifier before the record is sent to the database. In distributed systems, this data type serves globally unique identifiers.
sql_variant
The sql_variant data type is based on the same idea as the variant data type in Visual Basic. It is designed to allow a single variable, column, or parameter to store values in different data types. Internally, variant objects record two values: The actual value The metadata describing the variant: base data type, maximum size, scale, precision, and collation The following statement creates a lookup table that can store values of different types:
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Create table Lookup( LookupGroupId tinyint, LookupId smallint, LookupValue sql_variant) Go
Before SQL Server 2000, more than one field was needed to store lookup values of different data types. The following statements illustrate how you can insert different types of values in one column:
Insert Values Insert Values Insert Values Insert Values Lookup (LookupGroupId, (2, 34, 'VAR') Lookup (LookupGroupId, (3, 22, 2000) Lookup (LookupGroupId, (4, 16, '1/12/2000') Lookup (LookupGroupId, (4, 11, $50000) LookupId, LookupValue) LookupId, LookupValue) LookupId, LookupValue) LookupId, LookupValue)
A sql_variant object can store values of any data type except: text ntext image timestamp sql_variant But there are more serious restrictions on their use: sql_variant columns can be used in indexes and unique keys if the total length of the data in the key is shorter than 900 bytes. sql_variant columns cannot have an identity property. sql_variant columns cannot be part of a computed column. You must use functions for converting data types when assigning values from sql_variant objects to objects of other data types. The comparison of sql_variant values has complex rules and is prone to errors. sql_variant values are automatically converted to nvarchar(4000) when accessed from client applications using OLE DB Provider for SQL
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