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The decimal or numeric datatype does not lose digits when storing numbers. Unfortunately, it requires much more space than the real and float datatypes. When a decimal column or a variable is defined, the developer has to specify its scale and precision.
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Precision is the number of digits in the number, and scale is the number of digits behind the decimal point. For example, the number 123456.789 has a precision of 9 and a scale of 3. SQL Server can store decimal numbers with a maximum precision of 38. Naturally, scale is related to precision and can be less than or equal to precision.
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Create table Patient (PatientId int, FullName varchar(30), Weight decimal(5,2), Height decimal(5,2), ADP smallint, BDZ tinyint) go
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Decimal constants do not need delimiters either:
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insert into Patient (PatientId, FullName, Weight, Height, ADP, BDZ) values (834021, 'Tom Jones', 89.5, 188.5, 450, 11)
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The money and smallmoney datatypes are a compromise between the precision of decimal numbers and the small size of real numbers. Smallmoney occupies four bytes and uses the same internal structure as do int numbers. The last four digits are treated as digits behind the decimal point. For this reason, they can store numbers ranging from 214,768.3648 to 214,768.3647. The money datatype uses the same structure for storing information as the bigint datatype. It occupies eight bytes for storage, so its values must be range from 922,337,203,685,477.5808 to +922,337,203,685,477.5807:
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CREATE TABLE Inventory_2 ( Inventoryid bigint, EquipmentId int , LocationId smallint , StatusId tinyint , AcquisitionTypeID tinyint, Rent smallmoney, LeaseCost smallmoney) go
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4:
Basic Transact-SQL Programming Constructs
Monetary constants can be preceded by $ or one of 17 other currency symbols (you can see them listed in SQL Server Books Online):
update Inventory_2 Set Rent = $0, LeaseCost = $119.95 Where InventoryId = 3432
Binary Datatypes
binary datatypes are used to store strings of bits. SQL Server supports three basic binary datatypes, the attributes of which are similar to character datatypes:
w s v
binary varbinary image
binary and varbinary datatypes can store up to 8,000 bytes of information, and image can store up to 2GB of data:
CREATE TABLE MyTable ( Id int, BinData varbinary(8000), Diagram image) go
binary constants are written as hexadecimal representations of bit strings and prefixed with 0x (zero and x):
Update MyTable Set BinData = 0x82A7210B where Id = 121131
TIP: I doubt that you will often use binary datatypes. The image datatype is sometimes used to store binary files such as pictures, documents, or sound files, but these are not generally the types of information that should be kept in a relational database as opposed to a file system. It is recommended that you store just the path to those files in a database table.
SQL Server 2000 Stored Procedure Programming
The Timestamp Datatype
The timestamp is a datatype not designed to store date or time information, but a binary value that serves as a version number of the record. It is used to implement optimistic locking. You can find more details about this subject in 10. Only one field in a table can be defined as the timestamp value. It occupies eight bytes.
The Uniqueidentifier Datatype
The uniqueidentifier datatype stores 16-byte binary values. These values are often called Global Unique Identification numbers (GUID). 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 an API function that can produce a GUID value.
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