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sqlserver

作者:互联网

基本数据类型

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。

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。

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
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