unit
unit
pgunit : SI units extension
Overview
| ID | Extension | Package | Version | Category | License | Language |
|---|---|---|---|---|---|---|
| 3550 | unit | pgunit | 7.10 | TYPE | GPL-2.0 | C |
| Attribute | Has Binary | Has Library | Need Load | Has DDL | Relocatable | Trusted |
|---|---|---|---|---|---|---|
--s-d-- | No | Yes | No | Yes | no | no |
| Relationships | |
|---|---|
| Requires | plpgsql |
| See Also | pgmp numeral prefix semver pgpdf pglite_fusion md5hash asn1oid |
Packages
| Type | Repo | Version | PG Major Compatibility | Package Pattern | Dependencies |
|---|---|---|---|---|---|
| EXT | PGDG | 7.10 | 18 17 16 15 14 | pgunit | plpgsql |
| RPM | PGDG | 7.10 | 18 17 16 15 14 | postgresql-unit_$v | - |
| DEB | PGDG | 7.10 | 18 17 16 15 14 | postgresql-$v-unit | - |
| Linux / PG | PG18 | PG17 | PG16 | PG15 | PG14 |
|---|---|---|---|---|---|
el8.x86_64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
el8.aarch64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
el9.x86_64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
el9.aarch64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
el10.x86_64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
el10.aarch64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
d12.x86_64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
d12.aarch64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
d13.x86_64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
d13.aarch64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
u22.x86_64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
u22.aarch64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
u24.x86_64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
u24.aarch64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
u26.x86_64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
u26.aarch64 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 | PGDG 7.10 |
Source
Install
Make sure PGDG repo available:
pig repo add pgdg -u # add pgdg repo and update cacheInstall this extension with pig:
pig install pgunit; # install via package name, for the active PG version
pig install unit; # install by extension name, for the current active PG version
pig install unit -v 18; # install for PG 18
pig install unit -v 17; # install for PG 17
pig install unit -v 16; # install for PG 16
pig install unit -v 15; # install for PG 15
pig install unit -v 14; # install for PG 14Create this extension with:
CREATE EXTENSION unit CASCADE; -- requires plpgsqlUsage
The unit extension provides a data type for SI units, enabling dimensional analysis and unit conversion directly in SQL.
CREATE EXTENSION unit;
SELECT '9.81 m/s^2'::unit;
SELECT '120 km/h'::unit @ 'm/s' AS velocity; -- 33.3333333333333 m/sBase Units
meter (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), candela (cd), byte (B).
Operators
| Operator | Description | Example |
|---|---|---|
+, - | Add/subtract (same dimensions) | '1 m'::unit + '50 cm'::unit |
*, / | Multiply/divide | '5 kg'::unit * '9.81 m/s^2'::unit |
^ | Exponentiation by integer | '2 m'::unit ^ 3 |
@ | Convert to unit (returns unit) | '2 MB/min'::unit @ 'GB/d' |
@@ | Convert to unit (returns double precision) | '1 km'::unit @@ 'm' |
Functions
Mathematical: sqrt(), exp(), ln(), log2(), cbrt(), asin(), tan(), etc.
Aggregates: sum(unit), avg(unit), min(unit), max(unit), stddev(), variance().
Input Formats
SELECT '3|4 m'::unit; -- fractions: 0.75 m
SELECT '10:05:30 s'::unit; -- time format: 36330 s
SELECT 'm⁻²'::unit; -- Unicode superscriptsUnit Conversion
SELECT '2 MB/min'::unit @ 'GB/d'; -- 2.88 GB/d
SELECT '1 hl'::unit @ '0.5 l'; -- 200 * 0.5 l
SELECT '100 degC'::unit @ 'degF'; -- Fahrenheit conversionRange Type
SELECT unitrange('earthradius_polar', 'earthradius_equatorial');Configuration
unit.byte_output_iec: Binary prefixes (Ki, Mi, Gi)unit.output_base_units: Show only base unitsunit.time_output_custom: Format times using minutes/hours/daysunit.output_superscript: Unicode superscript exponents
Last updated on