1-- trunc(date, format) DUAL is for Oracle
2SELECT trunc(sysdate, 'Q') FROM DUAL; -- 1rst quarter day
3SELECT trunc(sysdate) FROM DUAL; -- today 00:00:00
4SELECT trunc(sysdate, 'YEAR') FROM DUAL; -- 1rst year day
5SELECT trunc(sysdate, 'MONTH') FROM DUAL; -- 1rst month day