SQL Server Books Online 中, 按"data types, described"索引, 如下:Data Types (T-SQL)
In Microsoft® SQL Server™, each column, local variable, expression, and parameter has a data type. The set of system-supplied data types is shown below. User-defined data types, which are aliases for system-supplied data types, can also be defined. For more information about user-defined data types, see sp_addtype and Creating User-defined Data Types. Integers
bit
Integer data with either a 1 or 0 value.
int
Integer (whole number) data from -2^31 (-2,147,483,648) through 2^31 - 1 (2,147,483,647).
smallint
Integer data from 2^15 (-32,768) through 2^15 - 1 (32,767).
tinyint
Integer data from 0 through 255.
decimal and numeric
decimal
Fixed precision and scale numeric data from -10^38 -1 through 10^38 -1.
numeric
A synonym for decimal.
money and smallmoney
money
Monetary data values from -2^63 (-922,337,203,685,477.5808) through 2^63 - 1 (+922,337,203,685,477.5807), with accuracy to a ten-thousandth of a monetary unit.
smallmoney
Monetary data values from -214,748.3648 through +214,748.3647, with accuracy to a ten-thousandth of a monetary unit.
Approximate Numerics
float
Floating precision number data from -1.79E + 308 through 1.79E + 308.
real
Floating precision number data from -3.40E + 38 through 3.40E + 38.
datetime and smalldatetime
datetime
Date and time data from January 1, 1753, to December 31, 9999, with an accuracy of three-hundredths of a second, or 3.33 milliseconds.
smalldatetime
Date and time data from January 1, 1900, through June 6, 2079, with an accuracy of one minute.
Numerics
cursor
A reference to a cursor.
timestamp
A database-wide unique number.
uniqueidentifier
A globally unique identifier (GUID).
Character Strings
char
Fixed-length non-Unicode character data with a maximum length of 8,000 characters.
varchar
Variable-length non-Unicode data with a maximum of 8,000 characters.
text
Variable-length non-Unicode data with a maximum length of 2^31 - 1 (2,147,483,647) characters.
Unicode Character Strings
nchar
Fixed-length Unicode data with a maximum length of 4,000 characters.
nvarchar
Variable-length Unicode data with a maximum length of 4,000 characters. sysname is a system-supplied user-defined data type that is a synonym for nvarchar(128) and is used to reference database object names.
ntext
Variable-length Unicode data with a maximum length of 2^30 - 1 (1,073,741,823) characters.
Binary Strings
binary
Fixed-length binary data with a maximum length of 8,000 bytes.
varbinary
Variable-length binary data with a maximum length of 8,000 bytes.
image
Variable-length binary data with a maximum length of 2^31 - 1 (2,147,483,647) bytes.
In Microsoft® SQL Server™, each column, local variable, expression, and parameter has a data type. The set of system-supplied data types is shown below. User-defined data types, which are aliases for system-supplied data types, can also be defined. For more information about user-defined data types, see sp_addtype and Creating User-defined Data Types. Integers
bit
Integer data with either a 1 or 0 value.
int
Integer (whole number) data from -2^31 (-2,147,483,648) through 2^31 - 1 (2,147,483,647).
smallint
Integer data from 2^15 (-32,768) through 2^15 - 1 (32,767).
tinyint
Integer data from 0 through 255.
decimal and numeric
decimal
Fixed precision and scale numeric data from -10^38 -1 through 10^38 -1.
numeric
A synonym for decimal.
money and smallmoney
money
Monetary data values from -2^63 (-922,337,203,685,477.5808) through 2^63 - 1 (+922,337,203,685,477.5807), with accuracy to a ten-thousandth of a monetary unit.
smallmoney
Monetary data values from -214,748.3648 through +214,748.3647, with accuracy to a ten-thousandth of a monetary unit.
Approximate Numerics
float
Floating precision number data from -1.79E + 308 through 1.79E + 308.
real
Floating precision number data from -3.40E + 38 through 3.40E + 38.
datetime and smalldatetime
datetime
Date and time data from January 1, 1753, to December 31, 9999, with an accuracy of three-hundredths of a second, or 3.33 milliseconds.
smalldatetime
Date and time data from January 1, 1900, through June 6, 2079, with an accuracy of one minute.
Numerics
cursor
A reference to a cursor.
timestamp
A database-wide unique number.
uniqueidentifier
A globally unique identifier (GUID).
Character Strings
char
Fixed-length non-Unicode character data with a maximum length of 8,000 characters.
varchar
Variable-length non-Unicode data with a maximum of 8,000 characters.
text
Variable-length non-Unicode data with a maximum length of 2^31 - 1 (2,147,483,647) characters.
Unicode Character Strings
nchar
Fixed-length Unicode data with a maximum length of 4,000 characters.
nvarchar
Variable-length Unicode data with a maximum length of 4,000 characters. sysname is a system-supplied user-defined data type that is a synonym for nvarchar(128) and is used to reference database object names.
ntext
Variable-length Unicode data with a maximum length of 2^30 - 1 (1,073,741,823) characters.
Binary Strings
binary
Fixed-length binary data with a maximum length of 8,000 bytes.
varbinary
Variable-length binary data with a maximum length of 8,000 bytes.
image
Variable-length binary data with a maximum length of 2^31 - 1 (2,147,483,647) bytes.
解决方案 »
免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货