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MSSQL SERVER 2005 數學函數
1.求相對值
ABS()
select FWeight-50,ABS(FWeight-50),ABS(-5.38) from T_Person
2.求冪
POWER(X,Y) 用來盤算X的Y次冪
select FWeight,POWER(FWeight,-0.5),POWER(FWeight,2),
POWER(FWeight,3),POWER(FWeight,4) from T_Person
select Power(2,2)
3.求平方根
SQRT()
select FWeight,SQRT(FWeight) from T_Person
4. 求隨機數
RAND() 支撐有參數，也能夠沒參數
select RAND()
select RAND(123)
5.捨入到最年夜整數
CEILING()
select FName,FWeight,CEILING(FWeight),CEILING(FWeight*-1) from T_Person
6.捨入到最小整數
FLOOR()
select FName,FWeight,FLOOR(FWeight),FLOOR(FWeight*-1) from T_Person
7.四捨五入
ROUND()
ROUND(m,d) m為待停止四捨五入的數值，d為盤算精度，也就是四捨五入時保存的小數位數
d為0表現不保存小數位，d為負值表現在整數部門停止四捨五入。
select FName,FWeight,ROUND(FWeight,1),ROUND(FWeight*-1,0),ROUND(FWeight,-1) from T_Person
8.求正弦值
SIN()
select FName,FWeight,SIN(FWeight)from T_Person
9.求余弦值
COS()
select FName,FWeight,COS(FWeight) from T_Person
10.求橫豎弦
ASIN()
select FName,FWeight,ASIN(1/FWeight) from T_Person
11.求反余弦
ACOS()
select FName,FWeight,ACOS(1/FWeight) from T_Person
12.求正切值
TAN()
select FName,FWeight,TAN(FWeight) from T_Person
13.求橫豎切值
ATAN()
select FName,FWeight,ATAN(FWeight) from T_Person
14.求兩個變量的橫豎切
ATN2(X,Y) 相似於盤算Y/X的橫豎切
select FName,FWeight,ATN2(Fweight,2) from T_Person
15.求余切
COT()
select FName,FWeight,COT(Fweight) from T_Person
16.求圓周率π值
PI()
select FName,FWeight,Fweight*PI(),PI() from T_Person
17.弧度制轉換為角度制
DEGREES() 成果的准確度與參數有關
select DEGREES(PI()),DEGREES(3.0),DEGREES(3)
18.角度制轉換為弧度制
RADIANS() 成果的准確度與參數有關
select RADIANS(180),RADIANS(180.0)
19.求符號
SIGN() 前往一個數值的符號，假如數值年夜於0則前往1，
假如數值等於0則前往0，假如數值小於0則前往-1.
成果的准確度與參數有關
select FName,FWeight-48.68,SIGN(FWeight-48.68),SIGN(1),SIGN(1.000) from T_Person
20.求整除余數 %
select FName,FWeight,FWeight%5 from T_Person
21.求天然對數
LOG()
select FName,FWeight,LOG(FWeight),LOG(1.00) from T_Person
22.求以10為底的對數
LOG10()
select FName,Fweight,LOG10(FWeight),LOG10(100) from T_Person
ps：
重要參照《法式員的SQL金典》
實例有所修改。
T_Person表的創立
create table T_Person
(
FIdNumber varchar(20),
FName varchar(20),
FBirthDay datetime,
FRegDay datetime,
FWeight numeric(10,2),
)
