Mathematical Functions and Operators
Numeric Operators
Description: Addition
Example:
```
postgres=# SELECT 2+3 AS RESULT;
result
--------
5
(1 row)
```
Description: Subtraction
Example:
```
postgres=# SELECT 2-3 AS RESULT;
result
--------
-1
(1 row)
```
*
Description: Multiplication
Example:
postgres=# SELECT 2*3 AS RESULT; result -------- 6 (1 row)/
Description: Division (The result is not rounded.)
Example:
postgres=# SELECT 4/2 AS RESULT; result -------- 2 (1 row)postgres=# SELECT 4/3 AS RESULT; result ------------------ 1.33333333333333 (1 row)+/-
Description: Positive/negative
Example:
postgres=# SELECT -2 AS RESULT; result -------- -2 (1 row)%
Description: Model (to obtain the remainder)
Example:
postgres=# SELECT 5%4 AS RESULT; result -------- 1 (1 row)@
Description: Absolute value
Example:
postgres=# SELECT @ -5.0 AS RESULT; result -------- 5.0 (1 row)^
Description: Power (exponent calculation)
Example:
postgres=# SELECT 2.0^3.0 AS RESULT; result -------------------- 8.0000000000000000 (1 row)|/
Description: Square root
Example:
postgres=# SELECT |/ 25.0 AS RESULT; result -------- 5 (1 row)||/
Description: Cubic root
Example:
postgres=# SELECT ||/ 27.0 AS RESULT; result -------- 3 (1 row)!
Description: Factorial
Example:
postgres=# SELECT 5! AS RESULT; result -------- 120 (1 row)!!
Description: Factorial (prefix operator)
Example:
postgres=# SELECT !!5 AS RESULT; result -------- 120 (1 row)&
Description: Binary AND
Example:
postgres=# SELECT 91&15 AS RESULT; result -------- 11 (1 row)|
Description: Binary OR
Example:
postgres=# SELECT 32|3 AS RESULT; result -------- 35 (1 row)#
Description: Binary XOR
Example:
postgres=# SELECT 17#5 AS RESULT; result -------- 20 (1 row)~
Description: Binary NOT
Example:
postgres=# SELECT ~1 AS RESULT; result -------- -2 (1 row)«
Description: Binary shift left
Example:
postgres=# SELECT 1<<4 AS RESULT; result -------- 16 (1 row)>>
Description: Binary shift right
Example:
postgres=# SELECT 8>>2 AS RESULT; result -------- 2 (1 row)
Numeric Operation Functions
abs(x)
Description: Absolute value
Return type: same as the input
Example:
postgres=# SELECT abs(-17.4); abs ------ 17.4 (1 row)acos(x)
Description: Arc cosine
Return type: double precision
Example:
postgres=# SELECT acos(-1); acos ------------------ 3.14159265358979 (1 row)asin(x)
Description: Arc sine
Return type: double precision
Example:
postgres=# SELECT asin(0.5); asin ------------------ .523598775598299 (1 row)atan(x)
Description: Arc tangent
Return type: double precision
Example:
postgres=# SELECT atan(1); atan ------------------ .785398163397448 (1 row)atan2(y, x)
Description: Arc tangent of y/x
Return type: double precision
Example:
postgres=# SELECT atan2(2, 1); atan2 ------------------ 1.10714871779409 (1 row)bitand(integer, integer)
Description: Performs AND (&) operation on two integers.
Return type: bigint
Example:
postgres=# SELECT bitand(127, 63); bitand -------- 63 (1 row)cbrt(dp)
Description: Cubic root
Return type: double precision
Example:
postgres=# SELECT cbrt(27.0); cbrt ------ 3 (1 row)ceil(x)
Description: Minimum integer greater than or equal to the parameter
Return type: integer
Example:
postgres=# SELECT ceil(-42.8); ceil ------ -42 (1 row)ceiling(dp or numeric)
Description: Minimum integer (alias of ceil) greater than or equal to the parameter
Return type: same as the input
Example:
postgres=# SELECT ceiling(-95.3); ceiling --------- -95 (1 row)cos(x)
Description: Cosine
Return type: double precision
Example:
postgres=# SELECT cos(-3.1415927); cos ------------------- -.999999999999999 (1 row)cot(x)
Description: Cotangent
Return type: double precision
Example:
postgres=# SELECT cot(1); cot ------------------ .642092615934331 (1 row)degrees(dp)
Description: Converts radians to angles.
Return type: double precision
Example:
postgres=# SELECT degrees(0.5); degrees ------------------ 28.6478897565412 (1 row)div(y numeric, x numeric)
Description: Integer part of y/x
Return type: numeric
Example:
postgres=# SELECT div(9,4); div ----- 2 (1 row)exp(x)
Description: Natural exponent
Return type: same as the input
Example:
postgres=# SELECT exp(1.0); exp -------------------- 2.7182818284590452 (1 row)floor(x)
Description: Not larger than the maximum integer of the parameter
Return type: same as the input
Example:
postgres=# SELECT floor(-42.8); floor ------- -43 (1 row)radians(dp)
Description: Converts angles to radians.
Return type: double precision
Example:
postgres=# SELECT radians(45.0); radians ------------------ .785398163397448 (1 row)random()
Description: Random number between 0.0 and 1.0
Return type: double precision
Example:
postgres=# SELECT random(); random ------------------ .824823560658842 (1 row)ln(x)
Description: Natural logarithm
Return type: same as the input
Example:
postgres=# SELECT ln(2.0); ln ------------------- .6931471805599453 (1 row)log(x)
Description: Logarithm with 10 as the base
Return type: same as the input
Example:
postgres=# SELECT log(100.0); log -------------------- 2.0000000000000000 (1 row)log(b numeric, x numeric)
Description: Logarithm with b as the base
Return type: numeric
Example:
postgres=# SELECT log(2.0, 64.0); log -------------------- 6.0000000000000000 (1 row)mod(x,y)
Description: Remainder of x/y (model) If x equals to 0, 0 is returned.
Return type: same as the parameter type
Example:
postgres=# SELECT mod(9,4); mod ----- 1 (1 row)postgres=# SELECT mod(9,0); mod ----- 9 (1 row)pi()
Description: π constant value
Return type: double precision
Example:
postgres=# SELECT pi(); pi ------------------ 3.14159265358979 (1 row)power(a double precision, b double precision)
Description: b power of a
Return type: double precision
Example:
postgres=# SELECT power(9.0, 3.0); power ---------------------- 729.0000000000000000 (1 row)round(x)
Description: Integer closest to the input parameter
Return type: same as the input
Example:
postgres=# SELECT round(42.4); round ------- 42 (1 row) postgres=# SELECT round(42.6); round ------- 43 (1 row)round(v numeric, s int)
Description: s digits are kept after the decimal point.
Return type: numeric
Example:
postgres=# SELECT round(42.4382, 2); round ------- 42.44 (1 row)setseed(dp)
Description: Sets seed for the following random() invoking (between -1.0 and 1.0, inclusive).
Return type: void
Example:
postgres=# SELECT setseed(0.54823); setseed --------- (1 row)sign(x)
Description: returns symbols of this parameter.
The return value type:-1 indicates negative. 0 indicates 0, and 1 indicates a positive number.
Example:
postgres=# SELECT sign(-8.4); sign ------ -1 (1 row)sin(x)
Description: Sine
Return type: double precision
Example:
postgres=# SELECT sin(1.57079); sin ------------------ .999999999979986 (1 row)sqrt(x)
Description: Square root
Return type: same as the input
Example:
postgres=# SELECT sqrt(2.0); sqrt ------------------- 1.414213562373095 (1 row)tan(x)
Description: Tangent
Return type: double precision
Example:
postgres=# SELECT tan(20); tan ------------------ 2.23716094422474 (1 row)trunc(x)
Description: truncates (the integral part).
Return type: same as the input
Example:
postgres=# SELECT trunc(42.8); trunc ------- 42 (1 row)trunc(v numeric, s int)
Description: Truncates a number with s digits after the decimal point.
Return type: numeric
Example:
postgres=# SELECT trunc(42.4382, 2); trunc ------- 42.43 (1 row)width_bucket(op numeric, b1 numeric, b2 numeric, count int)
Description: Returns a bucket to which the operand will be assigned in an equi-depth histogram with count buckets, ranging from b1 to b2.
Return type: int
Example:
postgres=# SELECT width_bucket(5.35, 0.024, 10.06, 5); width_bucket -------------- 3 (1 row)width_bucket(op dp, b1 dp, b2 dp, count int)
Description: Returns a bucket to which the operand will be assigned in an equi-depth histogram with count buckets, ranging from b1 to b2.
Return type: int
Example:
postgres=# SELECT width_bucket(5.35, 0.024, 10.06, 5); width_bucket -------------- 3 (1 row)