Oxla vs. PostgreSQL

Functions

Mathematical

A mathematical function operates on input values provided as arguments and returns a numeric value as the operation’s output.

Mathematical	Description	Example	Available in Oxla
ABS	Returns the absolute value of a number.	SELECT ABS(-11);	Available
CEIL	Returns the value after rounding up any positive or negative value to the nearest largest integer.	SELECT CEIL(53.7);	Available
FLOOR	Returns the value after rounding up any positive or negative decimal value as smaller than the argument.	SELECT FLOOR(53.6);	Available
LN	Returns the natural logarithm of a given number.	SELECT LN(3);	Available
RANDOM	Returns the random value between 0 and 1.	SELECT RANDOM();	Available
SQRT	Returns the square root of a given positive number.	SELECT SQRT(225);	Available

Trigonometric

Trigonometric	Description	Example	Available in Oxla
SIN	Returns the sine of the specified radian.	SELECT sin(0.2);	Available

Operators

Mathematical Operators

Below is a list of mathematical operators available in PostgreSQL:

Operator	Description	Example	Result	Available in Oxla
+	Addition	SELECT 5 + 8;	13	Available
-	Subtraction	SELECT 2 - 3;	\-1	Available
-	Negation	SELECT -4;	\-4	Available
		SELECT -(-4);	4	Available
		SELECT 5+(-2);	3	Available
		SELECT 5-(-2);	7	Available
*	Multiplication	SELECT 3 * 3;	9	Available
/	Division	SELECT 10 / 2;	5	Available
%	Modulo	SELECT 20 % 3;	2	Available
&	Bitwise AND	SELECT 91 & 15;	11	Available
#	Bitwise XOR	SELECT 17 # 5;	20	Available

JSON Operators

Oxla supports operators for handling JSON data. One such operator is:

Equal Operator (=)

This operator checks if two JSON values are identical. In Oxla, this operator is order-sensitive which means that for two JSON objects to be considered equal, their key-value pairs must appear in the exact same order.

SELECT '{"a":1, "b":"c"}'::json = '{"b":"c", "a":1}'::json;

Result

 ?column? 
----------
 f
(1 row)

In PostgreSQL, this operator is not order-sensitive, so the order of key-value pairs does not affect the comparison result.

Behaviors Difference

Output Header

Missing function name in output header, PostgreSQL shows the function name, like in this example:

SELECT COS(0),LN(1);

cos  | ln 
-----+-----
 1   | 0

Oxla does not show the function name, like in this example:

SELECT COS(0),LN(1);

 f | f_1 
---+-----
 1 | 0

ABS Output

Differences are also found in the ABS function, where there are differences in decimal results. The example below will return the absolute value of -1.0

SELECT ABS(-1.0);

It returns 1 in Oxla, while in PostgreSQL, it produces 1.0

Errors Difference

Functions	Input	Output - Oxla	Output - PostgreSQL
LN	LN(0)	Infinity	ERROR: cannot take the logarithm of zero
	LN(0.0)	Infinity	ERROR: cannot take the logarithm of zero
LOG10	LOG10(-1)	NaN	ERROR: cannot take logarithm of a negative number
SQRT	SQRT(-1)	input is out of range	ERROR: cannot take the square root of a negative number
SIN	SELECT sin(pi()/2);	unknown function pi	working as expected