十进制(p，s)和数字(p，s)
p (precision):
将存储的最大小数位数总数(小数点的左侧和右侧)
s (scale):
The number of decimal digits that will be stored to the right of the decimal point (-> s defines the number of decimal places)
0<；=s<；=P
Example:
CREATE TABLE dbo.MyTable
( MyDecimalColumn decimal(5,2)
,MyNumericColumn numeric(10,5)
);
INSERT INTO dbo.MyTable VALUES (123, 12345.12);
SELECT MyDecimalColumn, MyNumericColumn FROM dbo.MyTable;
结果:
MyDecimalColumn: 123.00 (p=5, s=2)
MyNumericColumn: 12345.12000 (p=10, s=5)