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MSSQL SERVER 2005 数学函数 1.求绝对值 ABS() select FWeight-50,ABS(FWeight-50),ABS(-5.38) from T_Person 2.求幂 POWER(X,Y) 用来计算X的Y次幂 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. 求随机数 RAND() 支持有参数，也可以没参数 select RAND() select RAND(123) 5.舍入到最大整数 CEILING() select FName,FWeight,CEILING(FWeight),CEILING(FWeight*-1) from T_Person 6.舍入到最小整数 FLOOR() select FName,FWeight,FLOOR(FWeight),FLOOR(FWeight*-1) from T_Person 7.四舍五入 ROUND() ROUND(m,d) m为待进行四舍五入的数值，d为计算精度，也就是四舍五入时保留的小数位数 d为0表示不保留小数位，d为负值表示在整数部分进行四舍五入。 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.求反正弦 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.求反正切值 ATAN() select FName,FWeight,ATAN(FWeight) from T_Person 14.求两个变量的反正切 ATN2(X,Y) 类似于计算Y/X的反正切 select FName,FWeight,ATN2(Fweight,2) from T_Person 15.求余切 COT() select FName,FWeight,COT(Fweight) from T_Person 16.求圆周率π值 PI() select FName,FWeight,Fweight*PI(),PI() from T_Person 17.弧度制转换为角度制 DEGREES() 结果的精确度与参数有关 select DEGREES(PI()),DEGREES(3.0),DEGREES(3) 18.角度制转换为弧度制 RADIANS() 结果的精确度与参数有关 select RADIANS(180),RADIANS(180.0) 19.求符号 SIGN() 返回一个数值的符号，如果数值大于0则返回1， 如果数值等于0则返回0，如果数值小于0则返回-1. 结果的精确度与参数有关 select FName,FWeight-48.68,SIGN(FWeight-48.68),SIGN(1),SIGN(1.000) from T_Person 20.求整除余数 % select FName,FWeight,FWeight%5 from T_Person 21.求自然对数 LOG() select FName,FWeight,LOG(FWeight),LOG(1.00) from T_Person 22.求以10为底的对数 LOG10() select FName,Fweight,LOG10(FWeight),LOG10(100) from T_Person ps： 主要参照《程序员的SQL金典》 实例有所改动。 T_Person表的创建 create table T_Person ( FIdNumber varchar(20), FName varchar(20), FBirthDay datetime, FRegDay datetime, FWeight numeric(10,2), ) |