Postgres 12

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CREATE TABLE t (
  id int,
  geom geometry(point) NOT NULL DEFAULT 'POINT EMPTY'
);
INSERT INTO t (id) VALUES (1),(2);
2 rows affected

SELECT * FROM t; 


id
geom


1
0101000000000000000000F87F000000000000F87F

2
0101000000000000000000F87F000000000000F87F


SELECT 
  'POINT EMPTY'::geometry,
  'POLYGON EMPTY'::geometry,
  'LINESTRING EMPTY'::geometry,
  'MULTILINESTRING EMPTY'::geometry,
  'MULTIPOLYGON EMPTY'::geometry,
  'MULTIPOINT EMPTY'::geometry;


geometry
geometry
geometry
geometry
geometry
geometry


0101000000000000000000F87F000000000000F87F
010300000000000000
010200000000000000
010500000000000000
010600000000000000
010400000000000000

id	geom
1	0101000000000000000000F87F000000000000F87F
2	0101000000000000000000F87F000000000000F87F