Question

我有一些代表年份的值。例如37.8年。我想将其在SQL Oracle中转换为三列：

年份：37
月：9
天数：18

如何在查询中做到这一点？

Answer 1

select 
  trunc(n) as years
 ,to_char(date'2020-01-01' + mod(n,1)*365, 'mm') as months
 ,to_char(date'2020-01-01' + mod(n,1)*365, 'dd') as days
from (select 37.8 n from dual);

YEARS   MONTHS  DAYS
37      10      19

Answer 2

您可以使用EXTRACT来获取值：

SELECT EXTRACT( YEAR  FROM dt ) - 1970 AS years,
       EXTRACT( MONTH FROM dt ) - 1 AS months,
       EXTRACT( DAY   FROM dt ) - 1 AS days
FROM   (
  SELECT DATE '1970-01-01' + 37.8 * 365.25 AS dt
  FROM   DUAL
)

哪个输出：

YEARS | MONTHS | DAYS
----: | -----: | ---:
   37 |      9 |   19

db <>提琴here

如何将年份（带逗号）转换为年，月和日

2 个答案: