在Oracle数据库中,可以使用以下方法来计算日期之间的差值:
SELECT (TO_DATE('2022-01-01', 'YYYY-MM-DD') - TO_DATE('2021-01-01', 'YYYY-MM-DD')) AS date_diff FROM dual;
SELECT MONTHS_BETWEEN(TO_DATE('2022-01-01', 'YYYY-MM-DD'), TO_DATE('2021-01-01', 'YYYY-MM-DD')) AS month_diff FROM dual;
SELECT TRUNC(MONTHS_BETWEEN(TO_DATE('2022-01-01', 'YYYY-MM-DD'), TO_DATE('2021-01-01', 'YYYY-MM-DD'))) AS month_diff FROM dual;