Fetching spatial data in internal format:

Fetching geometry values using internal format can be useful in table-to-table transfers:

CREATE TABLE geom2 (g GEOMETRY) SELECT g FROM geom;

Fetching spatial data in WKT format:

The ST_AsText() function converts a geometry from internal format to a WKT string.

SELECT ST_AsText(g) FROM geom;

Fetching spatial data in WKB format:

The ST_AsBinary() function converts a geometry from internal format to a BLOB containing the WKB value.

SELECT ST_AsBinary(g) FROM geom;