Su, Xiaomeng 76a5b1ee83 dli_sqlreference_20240227

Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: Su, Xiaomeng <suxiaomeng1@huawei.com>
Co-committed-by: Su, Xiaomeng <suxiaomeng1@huawei.com>

2024-03-27 22:02:33 +00:00

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Table 1 lists the mathematical functions supported by DLI.

**Table 1** Mathematical functions
Syntax	Value Type	Description
abs(DOUBLE a)	DOUBLE or INT	Returns the absolute value.
acos(DOUBLE a)	DOUBLE	Returns the arc cosine value of a.
asin(DOUBLE a)	DOUBLE	Returns the arc sine value of a.
atan(DOUBLE a)	DOUBLE	Returns the arc tangent value of a.
bin(BIGINT a)	STRING	Returns a number in binary format.
bround(DOUBLE a)	DOUBLE	In HALF_EVEN rounding, the digit 5 is rounded up if the digit before 5 is an odd number and rounded down if the digit before 5 is an even number. For example, bround(7.5) = 8.0, bround(6.5) = 6.0.
bround(DOUBLE a, INT d)	DOUBLE	The value is rounded off to d decimal places in HALF_EVEN mode. The digit 5 is rounded up if the digit before 5 is an odd number and rounded down if the digit before 5 is an even number. For example, bround(8.25, 1) = 8.2, bround(8.35, 1) = 8.4.
cbrt(DOUBLE a)	DOUBLE	Returns the cube root of a.
ceil(DOUBLE a)	DECIMAL	Returns the smallest integer that is greater than or equal to a. For example, ceil(21.2) = 22.
conv(BIGINT num, INT from_base, INT to_base), conv(STRING num, INT from_base, INT to_base)	STRING	Converts a number from from_base to to_base. For example, convert 5 from decimal to quaternary using conv(5,10,4) = 11.
cos(DOUBLE a)	DOUBLE	Returns the cosine value of a.
cot1(DOUBLE a)	DOUBLE or DECIMAL	Returns the cotangent of a specified radian value.
degrees(DOUBLE a)	DOUBLE	Returns the angle corresponding to the radian.
e()	DOUBLE	Returns the value of e.
exp(DOUBLE a)	DOUBLE	Returns the value of e raised to the power of a.
factorial(INT a)	BIGINT	Returns the factorial of a.
floor(DOUBLE a)	BIGINT	Returns the largest integer that is less than or equal to A. For example, floor(21.2) = 21.
greatest(T v1, T v2, ...)	DOUBLE	Returns the greatest value of a list of values.
hex(BIGINT a) hex(STRING a)	STRING	Converts an integer or character into its hexadecimal representation.
least(T v1, T v2, ...)	DOUBLE	Returns the least value of a list of values.
ln(DOUBLE a)	DOUBLE	Returns the natural logarithm of a given value.
log(DOUBLE base, DOUBLE a)	DOUBLE	Returns the natural logarithm of a given base and exponent.
log10(DOUBLE a)	DOUBLE	Returns the base-10 logarithm of a given value.
log2(DOUBLE a)	DOUBLE	Returns the base-2 logarithm of a given value.
median(colname)	DOUBLE or DECIMAL	Returns the median.
negative(INT a)	DECIMAL or INT	Returns the opposite number of a. For example, if negative(2) is given, –2 is returned.
percentile(colname,DOUBLE p)	DOUBLE or ARRAY	Returns the exact percentile, which is applicable to a small amount of data. Sorts a specified column in ascending order, and then obtains the exact pth percentage. The value of p must be between 0 and 1.
percentile_approx (colname,DOUBLE p)	DOUBLE or ARRAY	Returns the approximate percentile, which is applicable to a large amount of data. Sorts a specified column in ascending order, and then obtains the value corresponding to the pth percentile.
pi()	DOUBLE	Returns the value of pi.
pmod(INT a, INT b)	DECIMAL or INT	Returns the positive value of the remainder after division of x by y.
positive(INT a)	DECIMAL, DOUBLE, or INT	Returns the value of a, for example, positive(2) = 2.
pow(DOUBLE a, DOUBLE p), power(DOUBLE a, DOUBLE p)	DOUBLE	Returns the value of a raised to the power of p.
radians(DOUBLE a)	DOUBLE	Returns the radian corresponding to the angle.
rand(INT seed)	DOUBLE	Returns an evenly distributed random number that is greater than or equal to 0 and less than 1. If the seed is specified, a stable random number sequence is displayed.
round(DOUBLE a)	DOUBLE	Round off
round(DOUBLE a, INT d)	DOUBLE	Rounds a to d decimal places, for example, round(21.263,2) = 21.26.
shiftleft(BIGINT a, INT b)	INT	Bitwise signed left shift. Interprets a as a binary number and shifts the binary number b positions to the left.
shiftright(BIGINT a, INT b)	INT	Bitwise signed right shift. Interprets a as a binary number and shifts the binary number b positions to the right.
shiftrightunsigned(BIGINT a, INT b)	INT	Bitwise unsigned right shift. Interprets a as a binary number and shifts the binary number b positions to the right.
sign(DOUBLE a)	DOUBLE	Returns the sign of a. 1.0 is returned if a is positive. –1.0 is returned if a is negative. Otherwise, 0.0 is returned.
sin(DOUBLE a)	DOUBLE	Returns the sine value of the given angle a.
sqrt(DOUBLE a)	DOUBLE	Returns the square root of a.
tan(DOUBLE a)	DOUBLE	Returns the tangent value of the given angle a.

Parent topic: Mathematical Functions

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