Has X dimension?

hasX(box): boolean

SELECT hasX(tbox 'TBOX((, 2000-01-01), (, 2000-01-03))');
-- false
SELECT hasX(stbox 'STBOX((1.0, 2.0), (3.0, 4.0))');
-- true

Has Z dimension?

hasZ(stbox): boolean

SELECT hasZ(stbox 'STBOX((1.0, 2.0), (3.0, 4.0))');
-- false

Has T dimension?

hasT(box): boolean

SELECT hasT(tbox 'TBOX((1.0, 2000-01-01), (3.0, 2000-01-03))');
-- true
SELECT hasT(stbox 'STBOX((1.0, 2.0), (3.0, 4.0))');
-- false

Get the minimum X value

Xmin(box): float

SELECT Xmin(tbox 'TBOX((1.0, 2000-01-01), (3.0, 2000-01-03))');
-- 1
SELECT Xmin(stbox 'STBOX((1.0, 2.0), (3.0, 4.0))');
-- 1

Get the maximum X value

Xmax(box): float

SELECT Xmax(tbox 'TBOX((1.0, 2000-01-01), (3.0, 2000-01-03))');
-- 3
SELECT Xmax(stbox 'STBOX((1.0, 2.0), (3.0, 4.0))');
-- 3

Get the minimum Y value

Ymin(stbox): float

SELECT Ymin(stbox 'STBOX((1.0, 2.0), (3.0, 4.0))');
-- 2

Get the maximum Y value

Ymax(stbox): float

SELECT Ymax(stbox 'STBOX((1.0, 2.0), (3.0, 4.0))');
-- 4

Get the minimum Z value

Zmin(stbox): float

SELECT Zmin(stbox 'STBOX Z((1.0, 2.0, 3.0), (4.0, 5.0, 6.0))');
-- 3

Get the maximum Z value

Zmax(stbox): float

SELECT Zmax(stbox 'STBOX Z((1.0, 2.0, 3.0), (4.0, 5.0, 6.0))');
-- 6

Get the minimum T value

Tmin(box): timestamptz

SELECT Tmin(stbox 'GEODSTBOX T(( , , 2001-01-01), ( , , 2001-01-03))');
-- "2001-01-01"

Get the maximum T value

Tmax(box): timestamptz

SELECT Tmax(stbox 'GEODSTBOX T(( , , 2001-01-01), ( , , 2001-01-03))');
-- "2001-01-03"