Question

当我试图计算两个日期之间的月份时，我得到了错误的结果。

SELECT ROUND(MONTHS_BETWEEN(TO_DATE('23/01/2015','dd/mm/yyyy'),
       TO_DATE('26/10/2014','dd/mm/yyyy')))  
FROM dual;


SELECT ROUND(MONTHS_BETWEEN(TO_DATE('25/05/2015','dd/mm/yyyy'), 
       TO_DATE('05/05/2015','dd/mm/yyyy'))) 
FROM dual;

我必须得到第一个代码 - 4
在第二 - 1
但是我没那么做。

Answer 1

试试这个

select       
  trunc( months_between(TO_DATE('2015/01/23','yyyy/mm/dd'),
       TO_DATE('2014/10/26','yyyy/mm/dd')) ) mths    
FROM dual;

Answer 2

试试这个：

SELECT round(MONTHS_BETWEEN(TO_DATE('26/10/2014','dd/mm/yyyy'),TO_DATE('23/01/2015','dd/mm/yyyy')
       ))  
FROM dual;
 -3 
10/2014 to 11/2014 -- 1
11/2014 to 12/2015 -- 1
12/2015 to 01/2015 -- 1
so its 3. 
SELECT ROUND(MONTHS_BETWEEN(TO_DATE('05/05/2015','dd/mm/yyyy'),TO_DATE('25/05/2015','dd/mm/yyyy') 
       )) 
FROM dual;
-1

Answer 3

试试这个：

select
ceil(months_between(add_months(
      trunc(to_date('23/01/2015','dd/mm/yyyy'),'MM'),1)-1, --last day of  month
      trunc(to_date('26/10/2014','dd/mm/yyyy'),'MM')) --first_day of month
    ) months_between
    from dual;


select
      ceil(months_between(add_months(
            trunc(to_date('25/05/2015','dd/mm/yyyy'),'MM'),1)-1, --last day of  month
            trunc(to_date('05/05/2015','dd/mm/yyyy'),'MM'))--first_day of month
            ) months_between
from dual;

它返回4和1。 SQL Fiddle

Answer 4

最终我明白了：

SELECT TRUNC(ROUND(MONTHS_BETWEEN(TRUNC(TO_DATE('23/01/2015','dd/mm/yyyy'),'mm'),TRUNC(TO_DATE('15/01/2015','dd/mm/yyyy'),'mm')))) + 1 FROM dual ;

Answer 5

SELECT
  MONTHS_BETWEEN(LAST_DAY(DATE '2015-01-23')+1,     -- 1st of next month
                    TRUNC(DATE'2014-10-26', 'mon')) -- 1st of month
 ,MONTHS_BETWEEN(LAST_DAY(DATE '2015-05-25')+1, 
                    TRUNC(DATE'2015-05-05', 'mon'))
FROM DUAL;

请参阅Fiddle

如何计算两个日期之间的月份？

5 个答案: