src/pgperf/t/108_create_snapshot_pg_stat_database/input/test.sql

SELECT pgperf.create_snapshot_pg_stat_database(0);
SELECT count(*) FROM pgperf.snapshot_pg_stat_database;

SELECT pgperf.create_snapshot_pg_stat_database(1);
SELECT count(*) FROM pgperf.snapshot_pg_stat_database;

SELECT pgperf.create_snapshot_pg_stat_database(2);
SELECT count(*) FROM pgperf.snapshot_pg_stat_database;

SELECT pgperf.delete_snapshot_pg_stat_database(1);
SELECT count(*) FROM pgperf.snapshot_pg_stat_database;

SELECT pgperf.delete_snapshot_pg_stat_database(2);
SELECT count(*) FROM pgperf.snapshot_pg_stat_database;

SELECT pgperf.delete_snapshot_pg_stat_database(0);
SELECT count(*) FROM pgperf.snapshot_pg_stat_database;