mirror of
https://github.com/postgres/postgres.git
synced 2025-10-31 10:30:33 +03:00
15 lines
607 B
SQL
15 lines
607 B
SQL
CREATE EXTENSION tsm_system_rows;
|
|
|
|
CREATE TABLE test_tablesample (id int, name text) WITH (fillfactor=10); -- force smaller pages so we don't have to load too much data to get multiple pages
|
|
|
|
INSERT INTO test_tablesample SELECT i, repeat(i::text, 1000) FROM generate_series(0, 30) s(i) ORDER BY i;
|
|
ANALYZE test_tablesample;
|
|
|
|
SELECT count(*) FROM test_tablesample TABLESAMPLE system_rows (1000);
|
|
SELECT id FROM test_tablesample TABLESAMPLE system_rows (8) REPEATABLE (5432);
|
|
|
|
EXPLAIN SELECT id FROM test_tablesample TABLESAMPLE system_rows (20) REPEATABLE (10);
|
|
|
|
-- done
|
|
DROP TABLE test_tablesample CASCADE;
|