The following table describes the mathematical functions that are supported by PolarDB-X.

PolarDB-X supports the following mathematical functions.

Function Description Example
ABS(x) Returns the absolute value of the x argument. Calculate the absolute value of -1.

SELECT ABS(-1);

Sample response:

--1
ACOS(x) Calculates the arccosine of the x argument. The unit of the x argument is in radians.

SELECT ACOS(0.25);
ASIN(x) Calculates the arcsine of the x argument. The unit of the x argument is in radians.

SELECT ASIN(0.25);
ATAN(x) Calculates the arctangent of the x argument. The unit of the x argument is in radians.

SELECT ATAN(2.5);
ATAN2(n, m) Calculates the arctangent of the angle between the ray to the point (n, m) and the positive x-axis. The unit of the angle is in radians.

SELECT ATAN2(-0.8, 2);
AVG(expression) Returns the average value of an expression. The expression is a field. Calculate the average value of the Price field in the Products table.

SELECT AVG(Price) AS AveragePrice FROM Products;
CEIL(x) Returns the minimum integer that is not less than the x argument.

SELECT CEIL(1.5);

Sample response:

--2
CEILING(x) Returns the minimum integer that is not less than the x argument.

SELECT CEILING(1.5);

Sample response:

--2
COS(x) Calculates the cosine of the x argument. The unit of the x argument is in radians.

SELECT COS(2);
COT(x) Calculates the cotangent of the x argument. The unit of the x argument is in radians.

SELECT COT(6);
COUNT(expression) Returns the number of records in an expression. The expression is a field or an asterisk (*). Query the number of records in the ProductID field in the Products table.

SELECT COUNT(ProductID) AS NumberOfProducts FROM Products;
DEGREES(x) Converts an angle x that is expressed in radians to degrees.

SELECT DEGREES(3.1415926535898);

Sample response:

-- 180.0000000000004
n DIV m Returns the integer portion of the quotient that is obtained by dividing operand n by operand m. Query the integer portion of the quotient that is obtained by dividing 10 by 5.

SELECT 10 DIV 5;

Sample response:

-- 2
EXP(x) Calculates the value of e to the power of x. In the formula, e indicates Euler's number. Calculate the value of e to the power of 3.

SELECT EXP(3);

Sample response:

-- 20.085536923187668
FLOOR(x) Returns the maximum integer that is not greater than the x argument. Query the maximum integer that is not greater than 1.5.

SELECT FLOOR(1.5);

Sample response:

-- 1
GREATEST(expr1, expr2, expr3, ...) Returns the maximum value from a list of values. Query the maximum number from a list of numbers.

SELECT GREATEST(3, 12, 34, 8, 25);

Sample response:

-- 34

Query the maximum string from a list of strings.

SELECT GREATEST("Google", "Runoob", "Apple");

Sample response:

-- Runoob
LEAST(expr1, expr2, expr3, ...) Returns the minimum value from a list of values. Query the minimum number from a list of numbers.

SELECT LEAST(3, 12, 34, 8, 25);

Sample response:

-- 3

Query the minimum string from a list of strings.

SELECT LEAST("Google", "Runoob", "Apple");

Sample response:

-- Apple
LN Calculates the natural logarithm of a number. The natural logarithm of a number is its logarithm to the base of the mathematical constant e. Calculate the natural logarithm of 2.

SELECT LN(2);

Sample response:

-- 0.6931471805599453
LOG(x) or LOG(base, x) Returns the natural logarithm of x or the logarithm of x to a specified base. The natural logarithm of a number is its logarithm to the base of the mathematical constant e. If the base argument is specified, the function returns the logarithm of x to the base argument.

  • SELECT LOG(20.085536923188)

    Sample response:

    -- 3

  • SELECT LOG(2, 4);

    Sample response:

    -- 2
LOG10(x) Calculates the decimal logarithm of x.

SELECT LOG10(100) ;

Sample response:

-- 2
LOG2(x) Calculates the binary logarithm of x. Calculate the binary logarithm of 6.

SELECT LOG2(6);

Sample response:

-- 2.584962500721156
MAX(expression) Returns the maximum value in an expression. Query the maximum value in the Price field in the Products table.

SELECT MAX(Price) AS LargestPrice FROM Products;
MIN(expression) Returns the minimum value in an expression. Query the minimum value in the Price field in the Products table.

SELECT MIN(Price) AS MinPrice FROM Products;
MOD(x,y) Calculates the remainder that is obtained by dividing x by y. Calculate the remainder that is obtained by dividing 5 by 2.

SELECT MOD(5,2);

Sample response:

-- 1
PI() Returns the value of pi that is rounded to six decimal places. Sample response: 3.141593.

SELECT PI();

Sample response:

--3.141593
POW(x,y) Calculates the value of x to the power of y. Calculate 2 to the power of 3.

SELECT POW(2,3);

Sample response:

-- 8
POWER(x,y) Calculates the value of x to the power of y. Calculate 2 to the power of 3.

SELECT POWER(2,3);

Sample response:

-- 8
RADIANS(x) Converts an angle x that is expressed in degrees to radians. Convert 180° to a value in radians.

SELECT RADIANS(180);

Sample response:

-- 3.1415926535898
RAND() Returns a random number from 0 to 1.

SELECT RAND();

Sample response:

--0.93099315644334
ROUND(x) Rounds the x argument to the nearest integer.

SELECT ROUND(1.23456;

Sample response:

--1
SIGN(x) Returns a number to indicate whether the x argument is 0, negative, or positive. The value -1 is returned if the x argument is negative. The value 0 is returned if the x argument is 0. The value 1 is returned if the x argument is positive.

SELECT SIGN(-10);

Sample response:

-- (-1)
SIN(x) Calculates the sine of the x argument. The unit of the x argument is in radians.

SELECT SIN(RADIANS(30));

Sample response:

-- 0.5
SQRT(x) Calculates the square root of the x argument. Calculate the square root of 25.

SELECT SQRT(25);

Sample response:

-- 5
SUM(expression) Calculates the sum of the values in an expression. Calculate the sum of the values in the Quantity field in the OrderDetails table.

SELECT SUM(Quantity) AS TotalItemsOrdered FROM OrderDetails;
TAN(x) Calculates the tangent of the x argument. The unit of the x argument is in radians.

SELECT TAN(1.75);

Sample response:

-- -5.52037992250933
TRUNCATE(x,y) Truncates the argument x to y decimal places without rounding a decimal value. The ROUND(x) function rounds x to the nearest integer.

SELECT TRUNCATE(1.23456,3);

Sample response:

-- 1.234