Usage
Syntax
Create a complete-refresh materialized view.
CREATE MATERIALIZED VIEW [ view_name ] AS { query_block };
Fully refresh a materialized view.
REFRESH MATERIALIZED VIEW [ view_name ];
Delete a materialized view.
DROP MATERIALIZED VIEW [ view_name ];
Query a materialized view.
SELECT * FROM [ view_name ];
Examples
-- Prepare data.
openGauss=# CREATE TABLE t1(c1 int, c2 int);
openGauss=# INSERT INTO t1 VALUES(1, 1);
openGauss=# INSERT INTO t1 VALUES(2, 2);
-- Create a complete-refresh materialized view.
openGauss=# CREATE MATERIALIZED VIEW mv AS select count(*) from t1;
CREATE MATERIALIZED VIEW
-- Query the materialized view result.
openGauss=# SELECT * FROM mv;
count
-------
2
(1 row)
-- Insert data into the base table in the materialized view.
openGauss=# INSERT INTO t1 VALUES(3, 3);
INSERT 0 1
-- Fully refresh the complete-refresh materialized view.
openGauss=# REFRESH MATERIALIZED VIEW mv;
REFRESH MATERIALIZED VIEW
-- Query the materialized view result.
openGauss=# SELECT * FROM mv;
count
-------
3
(1 row)
-- Delete the materialized view.
openGauss=# DROP MATERIALIZED VIEW mv;
DROP MATERIALIZED VIEW
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