rw_int256 values can be very large, and therefore require more memory and processing power compared to smaller data types.

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Overview

rw_int256 is a custom data type that represents a signed 256-bit integer with a storage size of 32 bytes.

It is designed to handle large integer values, and can be useful in financial calculations, cryptography, and data analysis.

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Usage

You can define a column with the rw_int256 type:

CREATE TABLE table_name (column_name rw_int256);

CREATE TABLE t (v rw_int256);
INSERT INTO t VALUES (1), (100), (10000), (100000000), (10000000000000000), ('100000000000000000000000000000000'), (0), (-1), (-100), (-10000), (-100000000), (-10000000000000000), ('-100000000000000000000000000000000');

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Casting

You can also convert other data types to rw_int256:

cast ('0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe' AS rw_int256);
-- or
'10000000000000000' :: rw_int256;

Or convert rw_int256 to double.

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Supported functions

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count

Returns the number of non-null rows.

count ( [ DISTINCT ] rw_int256 ) -> bigint

SELECT count(v) FROM t;

13

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min

Returns the minimum value in a set of values.

min ( rw_int256 ) -> rw_int256

SELECT min(v) FROM t;

-100000000000000000000000000000000

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max

Returns the maximum value in a set of values.

max ( rw_int256 ) -> rw_int256

SELECT max(v) FROM t;

100000000000000000000000000000000

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sum

Returns the sum of all input values.

sum ( [ DISTINCT ] rw_int256 ) -> rw_int256

SELECT sum(v) FROM t;

0

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avg

Returns the average (arithmetic mean) of the selected values.

avg ( [ DISTINCT ] rw_int256 ) -> double

SELECT avg(v) FROM t;

0

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hex_to_int256

Converts a hexadecimal string to a 256-bit integer.

hex_to_int256 ( string ) -> rw_int256

SELECT hex_to_int256('0xdeadbeef');

3735928559

SELECT hex_to_int256('0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff01');

-255

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Standard deviation and variance

Returns population standard deviation, sample standard deviation, population variance, and sample variance.

stddev_pop ( rw_int256 ) -> double -- standard deviation
stddev_samp ( rw_int256 ) -> double -- sample standard deviation
var_pop ( rw_int256 ) -> double -- population variance
var_samp ( rw_int256 ) -> double -- sample variance

SELECT stddev_pop(v), stddev_samp(v), var_pop(v), var_samp(v) FROM t;

       stddev_pop       |     stddev_samp      |        var_pop         |        var_samp
------------------------+----------------------+------------------------+------------------------
 3.9223227027636808e+31 | 4.08248290463863e+31 | 1.5384615384615386e+63 | 1.6666666666666666e+63
(1 row)