检查当前日期是否在两个日期之间 Oracle SQL
如果当前日期介于 2 个日期之间，我想通过 Oracle SQL 选择 1.
I would like to select 1 if current date falls between 2 dates through Oracle SQL.
我在阅读其他问题后写了一个 SQL.
I wrote an SQL after reading through other questions.
https://stackoverflow.com/questions/2369222/oracle-date-between-query
https://stackoverflow.com/questions/2399753/select-from-table-by-knowing-only-date-without-time-oracle
但它只返回空值.sysdate 是01/05/2014 的当前日期，日期格式为DD/MM/YYYY.
But it returned only null. sysdate is the current date that is 01/05/2014 in date format DD/MM/YYYY.
我写的SQL是:
select 1 from dual
WHERE to_date(sysdate,'DD/MM/YYYY')
BETWEEN TO_DATE('28/02/2014', 'DD/MM/YYYY')
AND TO_DATE('20/06/2014', 'DD/MM/YYYY');
和
select 1 from dual
WHERE to_date(sysdate,'DD/MM/YYYY') >= TO_DATE('28/02/2014', 'DD/MM/YYYY')
AND to_date(sysdate,'DD/MM/YYYY') < TO_DATE('20/06/2014', 'DD/MM/YYYY');
推荐答案
您不需要将 to_date() 应用到 sysdate.它已经在那里了:
You don't need to apply to_date() to sysdate. It is already there:
select 1
from dual
WHERE sysdate BETWEEN TO_DATE('28/02/2014', 'DD/MM/YYYY') AND TO_DATE('20/06/2014', 'DD/MM/YYYY');
如果你关心日期上的时间分量，那么使用trunc():
If you are concerned about the time component on the date, then use trunc():
select 1
from dual
WHERE trunc(sysdate) BETWEEN TO_DATE('28/02/2014', 'DD/MM/YYYY') AND
TO_DATE('20/06/2014', 'DD/MM/YYYY');
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