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HomeDatabaseMysql TutorialPL/SQL Number数字类型函数

PL/SQL Number数字类型函数

ABS(x) 函数,此函数用来返回一个数的绝对值。
ACOS(x)函数,返回X的反余弦值。X范围从1到-1,输入值从0到派,以弧度为单位。
ASIN(x)函数,返回X的反正弦值。X范围从1到-1,输入值从-PI/2到PI/2,以弧度为单位。
ATAN(x)函数,返回X的反正切值。输入值从-PI/2到PI/2,以弧度为单位。
BITAND(x,y)函数,返回X和Y的与结果。X和Y必须为非负整数。注意没有BITOR函数,但是在UTL_RAW包中有用 于RAW值的位操作符。
CEIL(x)函数,用来返回大于或等于X的最小整数。
COS(x)函数,返回x的余弦值。x是以弧度表示的角度。
COSH(x)函数,返回X的双曲余弦。
EXP(x)函数,与power(x,y)函数类似,不过不用指明基数,返回E的X次幂。E=2.71828183...
FLOOR(x)函数,用来返回小于或等于X的最大整数。
LN(x)函数,返回x的自然对数。x必须大于0。
LOG(x,y)函数,返回以X为底Y的对数。底必须是不为0和1的正数,Y是任意正数。
MOD(被除数,除数)求余函数,如果除数为0,则返回被除数。
POWER(x,y)函数,返回X的Y次幂。底X和指数Y都不必是正整数,但如果X是负数的话,Y必须是整数。
ROUND(x[,y])函数,返回舍入到小数点右边Y位的X值。Y缺省为0,这将X舍入为最接近的整数。如果Y是负数, 那么舍入到小数点左边相应的位上,Y必须为整数。
SIGN(x)函数,此函数用来返回一个数的正负值,若为一个正数则返回1,若为一个负数则返回-1,
若为0则仍返回0,有点像把模拟量数字化的意思。
SIN(x)函数,返回X的正弦。x是以弧度表示的角度。
SINH(x)函数,返回x的双曲正弦。
SQRT(x)函数,返回x的平方根,x不能是负数。
TAN(x)函数,返回x的正切。x是以弧度表示的角度。
TANH(x)函数,返回x的双曲正切。
TRUNC(x[,y])截取值函数,Y缺省为0,这样X被截取成一个整数。如果Y为负数,那么截取到小数点左边相应位置
WIDTH_BUCKET(x,min,max,num_buckets) 只能在SQL语句中使用。
使用WIDTH_BUCKET可以根据输入参数创建等长的段。范围MIN到MAX被分为num_buckets节,每节有相同的大小。返回X所在的那一节。如果X小于MIN,将返回0,如果X大于或等于MAX,将返回num_buckets+1.MIN和MAX
都不能为NULL,num_buckets必须是一个正整数。如果X是NULL,则返回NULL。
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