1.求絕對值 ，正值，負值：
ABS(numeric_type a)
POSITIVE(numeric_type a)
NEGATIVE(numeric_type a)
NEGATIVE 等同於 -abs(a)
POSITIVE 等同於 abs()
2.求余數，求商：
QUOTIENT(BIGINT numerator, BIGINT denominator), QUOTIENT(DOUBLE numerator, DOUBLE denominator)
FMOD(DOUBLE a, DOUBLE b), FMOD(FLOAT a, FLOAT b)
MOD(numeric_type a, same_type b)
PMOD(BIGINT a, BIGINT b), PMOD(DOUBLE a, DOUBLE b)
3.取浮點數的精度和小數點位數：
SCALE(numeric_expression)
PRECISION(numeric_expression)
4.階乘運算
FACTORIAL(integer_type a)
階乘函數和！符合效果一樣
5.向上和向下取數
CEIL(DOUBLE a), CEIL(DECIMAL(p,s) a), CEILING(DOUBLE a), CEILING(DECIMAL(p,s) a), DCEIL(DOUBLE a), DCEIL(DECIMAL(p,s) a)
FLOOR(DOUBLE a), FLOOR(DECIMAL(p,s) a), DFLOOR(DOUBLE a), DFLOOR(DECIMAL(p,s) a)
6.常量函數pi和e
E
PI
7.求n次方 和求開方
POW(DOUBLE a, double p), POWER(DOUBLE a, DOUBLE p), DPOW(DOUBLE a, DOUBLE p), FPOW(DOUBLE a, DOUBLE p)
SQRT(DOUBLE a), DSQRT(DOUBLE a)
8.進制轉換：
BIN(BIGINT a)
HEX(BIGINT a), HEX(STRING a)
UNHEX(STRING a)
CONV(BIGINT n, INT from_base, INT to_base), CONV(STRING s, INT from_base, INT to_base)
9.去最大值和最小值
GREATEST,LEAST
10.判斷是否為無窮和NAN
IS_INF(DOUBLE a)
IS_NAN(DOUBLE a)
11.偽隨機數：
RAND(), RAND(BIGINT seed), RANDOM(), RANDOM(BIGINT seed)
12. 分桶函數：Postgresql 9.6+ 和Oracle都支持的函數。
WIDTH_BUCKET(DECIMAL expr, DECIMAL min_value, DECIMAL max_value, INT num_buckets)
13.近視數取數：
TRUNCATE, DTRUNC, TRUNC
ROUND, DROUND
支持的數據類型：
ROUND(DOUBLE a), ROUND(DOUBLE a, INT d), ROUND(DECIMAL a, int_type d), DROUND(DOUBLE a), DROUND(DOUBLE a, INT d), DROUND(DECIMAL(p,s) a, int_type d)
TRUNCATE(DOUBLE_or_DECIMAL a[, digits_to_leave]), DTRUNC(DOUBLE_or_DECIMAL a[, digits_to_leave]), TRUNC(DOUBLE_or_DECIMAL a[, digits_to_leave])
14.HASH 函數：
FNV_HASH(type v)
MURMUR_HASH(type v)
15.LOG函數
16.正弦和余弦函數：
DEGREES(DOUBLE a)
RADIANS(DOUBLE a)
ACOS
ASIN
ATAN
ATAN2
COS
COSH
COT
SIGN
SIN
SINH
TAN
TANH
參考：
https://docs.cloudera.com/documentation/enterprise/latest/topics/impala_math_functions.html
http://impala.apache.org/docs/build3x/html/topics/impala_math_functions.html
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原文鏈接：https://blog.csdn.net/vkingnew/article/details/109816921