PostgreSQL example

suggest change

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)

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