sqlserver
作者：互联网
基本数据类型
- 整形数据：
| bigint | 8 byte |
| int | 4 byte |
| smallint | 2 byte |
| tinyint | 1 byte |
C#定义的整形数据
| long | 8 byte |
| ulong | 8 byte |
| int | 4 byte |
| uint | 4 byte |
| short | 2 byte |
| ushort | 2 byte |
| sbyte | 1 byte |
| byte | 1 byte |
是能一一对应上的。
- 浮点类型：
| | |
| ------------ | ------------ |
| real | |
| | |
float [ (n) ] Where n is the number of bits that are used to store the mantissa of the float number in scientific notation and, therefore, dictates the precision and storage size. If n is specified, it must be a value between 1 and 53. The default value of n is 53.
mantissa n.对数
notation n.符号
| type | n | |
|---|---|---|
| float/real | 1~24 | 4 byte |
| float | 24~53 | 8 byte |
可以发现与C#中的浮点类一样。因为两者都是符合ISO规范的。
- 精确计数
decimal[(p[,s])]
numeric[(p[,s])]
p (precision)
The maximum total number of decimal digits to be stored. This number includes both the left and the right sides of the decimal point. The precision must be a value from 1 through the maximum precision of 38. The default precision is 18.
p是指数字位数，包括整数和小数。值域为[1,38]。默认为18。
s (scale)
The number of decimal digits that are stored to the right of the decimal point. This number is subtracted from p to determine the maximum number of digits to the left of the decimal point. Scale must be a value from 0 through p, and can only be specified if precision is specified. The default scale is 0 and so 0 <= s <= p. Maximum storage sizes vary, based on the precision.
s是指整数位数，值域[0,p]，可以不指定。
| Precision | Storage bytes |
|---|---|
| 1 - 9 | 5 |
| 10-19 | 9 |
| 20-28 | 13 |
| 29-38 | 17 |
- 货币计算
| smallmoney | 8 byte |
| money | 4 byte |
储存时不会储存货币符号，只会储存数值。
标签：decimal,float,sqlserver,number,value,precision,byte 来源： https://www.cnblogs.com/none323/p/15190170.html