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Microsoft Transact SQL Server 2005 Data Types

Datatype

Min

Max

Storage

Type

Notes

Bigint -2^63 2^63-1 8 bytes Exact
Int -2,147,483,648 2,147,483,647 4 bytes Exact
Smallint -32,768 32,767 2 bytes Exact
Tinyint 0 255 1 bytes Exact
Bit 0 1 1 to 8 bit columns in the same table requires a total of 1 byte, 9 to 16 bits = 2 bytes, etc... Exact
Decimal -10^38+1 10^38–1 Precision 1-9 = 5 bytes, precision 10-19 = 9 bytes, precision 20-28 = 13 bytes, precision 29-38 = 17 bytes Exact The Decimal and the Numeric data type is exactly the same. Precision is the total number of digits. Scale is the number of decimals. For both the minimum is 1 and the maximum is 38.
Numeric same as Decimal same as Decimal same as Decimal Exact
Money -2^63 / 10000 2^63-1 / 10000 8 bytes Exact
Smallmoney -214,748.3648 214,748.3647 4 bytes Exact
Float -1.79E + 308 1.79E + 308 4 bytes when precision is less than 25 and 8 bytes when precision is 25 through 53 Approx Precision is specified from 1 to 53.
Real -3.40E + 38 3.40E + 38 4 bytes Approx Precision is fixed to 7.
Datetime 1753-01-01 00:00:00.000 9999-12-31 23:59:59.997 8 bytes Datetime If you are running SQL Server 2008 or later and need milliseconds precision, use datetime2(3) instead to save 1 byte.
Smalldatetime 1900-01-01 00:00 2079-06-06 23:59 Datetime
Char 0 chars 8000 chars Defined width String Fixed width
Varchar 0 chars 8000 chars 2 bytes + number of chars String Variable width
Varchar(max) 0 chars 2^31 chars 2 bytes + number of chars String Variable width
Text 0 chars 2,147,483,647 chars 4 bytes + number of chars String Variable width
Nchar 0 chars 4000 chars Defined width x 2 Unicode Fixed width
Nvarchar 0 chars 4000 chars Unicode Variable width
Nvarchar(max) 0 chars 2^30 chars Unicode Variable width
Ntext 0 chars 1,073,741,823 chars Unicode Variable width
Binary 0 bytes 8000 bytes Binary Fixed width
Varbinary 0 bytes 8000 bytes Binary Variable width
Varbinary(max) 0 bytes 2^31 bytes Binary Variable width
Image 0 bytes 2,147,483,647 bytes Binary Variable width. Prefer to use the varbinary(max) type as the image type will be removed in future versions.
Sql_variant Other Stores values of various SQL Server-supported data types, except text, ntext, and timestamp.
Timestamp Other Stores a database-wide unique number that gets updated every time a row gets updated.
Uniqueidentifier Other Stores a globally unique identifier (GUID).
Xml Other Stores XML data. You can store xml instances in a column or a variable.
Cursor Other A reference to a cursor.
Table Other Stores a result set for later processing.

See also:


file: /Techref/language/sql/2005DataTypes.htm, 6KB, , updated: 2017/8/7 09:14, local time: 2020/10/22 14:27,
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