统计信息同步 random()::text), 1, 10), substr(md5(random()::text), 1, 50), md5(random()::text), CURRENT_DATE - (trunc(random() * 3650) || ' days')::INTERVAL, CURRENT_TIME - (trunc(random() * 86400) || ' seconds')::INTERVAL, CURRENT_TIMESTAMP - (trunc(random() * 3650