CREATE TRANSFORM is a DDL command to create a transform.
CREATE TRANSFORM was added in PostgreSQL 9.5 and is a PostgreSQL extension to the SQL standard.
Note there is no
ALTER TRANSFORM command.
CREATE TRANSFORM has not changed since being added in PostgreSQL 9.5.
CREATE TRANSFORM will usually be executed by an
transforms for a particular
procedural language. See the
transform entry for a list of such extensions provided as