unit
unit
pgunit : SI units extension
Overview
| ID | Extension | Package | Version | Category | License | Language |
|---|---|---|---|---|---|---|
| 3520 | 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
|
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
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