Return Type |
Name (Signature) |
Description |
---|---|---|
DOUBLE |
round(DOUBLE a) |
返回对a四舍五入的BIGINT值 |
DOUBLE |
round(DOUBLE a, INT d) |
返回DOUBLE型的保留d位小数的DOUBLW型的近似值 |
DOUBLE | bround(DOUBLE a) | 银行家舍入法(1~4:舍,6~9:进,5->前位数是偶:舍,5->前位数是奇:进) |
DOUBLE | bround(DOUBLE a, INT d) | 银行家舍入法,保留d位小数 |
BIGINT |
floor(DOUBLE a) |
向下取整,最数轴上最接近要求的值的左边的值 如:6.10->6 -3.4->-4 |
BIGINT |
ceil(DOUBLE a), ceiling(DOUBLE a) |
求其不小于小给定实数的最小整数如:ceil(6) = ceil(6.1)= ceil(6.9) = 6 |
DOUBLE |
rand(), rand(INT seed) |
每行返回一个DOUBLE型随机数seed是随机因子 |
DOUBLE |
exp(DOUBLE a), exp(DECIMAL a) |
返回e的a幂次方, a可为小数 |
DOUBLE |
ln(DOUBLE a), ln(DECIMAL a) |
以自然数为底d的对数,a可为小数 |
DOUBLE |
log10(DOUBLE a), log10(DECIMAL a) |
以10为底d的对数,a可为小数 |
DOUBLE |
log2(DOUBLE a), log2(DECIMAL a) |
以2为底数d的对数,a可为小数 |
DOUBLE |
log(DOUBLE base, DOUBLE a) log(DECIMAL base, DECIMAL a) |
以base为底的对数,base 与 a都是DOUBLE类型 |
DOUBLE |
pow(DOUBLE a, DOUBLE p), power(DOUBLE a, DOUBLE p) |
计算a的p次幂 |
DOUBLE |
sqrt(DOUBLE a), sqrt(DECIMAL a) |
计算a的平方根 |
STRING |
bin(BIGINT a) |
算二进制a的STRING类型,a为BIGINT类型 |
STRING |
hex(BIGINT a), hex(STRING a), hex(BINARY a) |
计算十六进制a的STRING类型,如果a为STRING类型就转换成字符相对应的十六进制 |
BINARY |
unhex(STRING a) |
hex的逆方法 |
STRING |
conv(BIGINT num, INT from_base, INT to_base), conv(STRING num, INT from_base, INT to_base) |
将GIGINT/STRING类型的num从from_base进制转换成to_base进制 |
DOUBLE |
abs(DOUBLE a) |
计算a的绝对值 |
INT or DOUBLE |
pmod(INT a, INT b), pmod(DOUBLE a, DOUBLE b) |
a对b取模 |
DOUBLE |
sin(DOUBLE a), sin(DECIMAL a) |
求a的正弦值 |
DOUBLE |
asin(DOUBLE a), asin(DECIMAL a) |
求d的反正弦值 |
DOUBLE |
cos(DOUBLE a), cos(DECIMAL a) |
求余弦值 |
DOUBLE |
acos(DOUBLE a), acos(DECIMAL a) |
求反余弦值 |
DOUBLE |
tan(DOUBLE a), tan(DECIMAL a) |
求正切值 |
DOUBLE |
atan(DOUBLE a), atan(DECIMAL a) |
求反正切值 |
DOUBLE |
degrees(DOUBLE a), degrees(DECIMAL a) |
奖弧度值转换角度值 |
DOUBLE |
radians(DOUBLE a), radians(DOUBLE a) |
将角度值转换成弧度值 |
INT or DOUBLE |
positive(INT a), positive(DOUBLE a) |
返回a |
INT or DOUBLE |
negative(INT a), negative(DOUBLE a) |
返回a的相反数 |
DOUBLE or INT |
sign(DOUBLE a), sign(DECIMAL a) |
如果a是正数则返回1.0,是负数则返回-1.0,否则返回0.0 |
DOUBLE |
e() |
数学常数e |
DOUBLE |
pi() |
数学常数pi |
BIGINT | factorial(INT a) | 求a的阶乘 |
DOUBLE | cbrt(DOUBLE a) | 求a的立方根 |
INT BIGINT |
shiftleft(TINYINT|SMALLINT|INT a, INT b) shiftleft(BIGINT a, INT b) |
按位左移 |
INT BIGINT |
shiftright(TINYINT|SMALLINT|INT a, INTb) shiftright(BIGINT a, INT b) |
按拉右移 |
INT BIGINT |
shiftrightunsigned(TINYINT|SMALLINT|INTa, INT b), shiftrightunsigned(BIGINT a, INT b) |
无符号按位右移(<<<) |
T | greatest(T v1, T v2, ...) | 求最大值 |
T | least(T v1, T v2, ...) | 求最小值 |
Hive(三)-内置函数-数学函数
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转载自www.cnblogs.com/sunziying/p/9068724.html
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