CREATE TABLE mytable (number INT);
INSERT INTO mytable VALUES (1);
CREATE MATERIALIZED VIEW myview AS SELECT * FROM mytable;
SELECT * FROM myview;
number
--------
1
(1 row)
INSERT INTO mytable VALUES(2);
SELECT * FROM myview;
number
--------
1
(1 row)
REFRESH MATERIALIZED VIEW myview;
SELECT * FROM myview;
number
--------
1
2
(2 rows)