두 날짜를 뺄 때 조건이 작동하지 않으며 그 차이가 일부 숫자보다 큽니다.

Question

아래의 where 절을 지정했는데 쿼리가 4보다 큰지 여부와 관계없이 쿼리가 결과를 제공합니다. 당신은 나에게 어떤 문제가 있는지

where to_number(
    end_date - (case when start_date > to_date('01-01-2014','dd-mm-yyyy') 
    then start_date 
    else to_date('01-01-2014','dd-mm-yyyy') end) 
) > 4 

Answer 1

조회에 모두 오라클 (11)와 Oracle (12)에 나를 위해 작동 알려 주시기 바랍니다 수 : 데이터의 4 개 행이 선택되었다는 것을

가

with data (start_date, end_date) 
    as (
    select to_date('31-01-2014','dd-mm-yyyy') as start_date, to_date('05-02-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('31-12-2013','dd-mm-yyyy') as start_date, to_date('01-01-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('31-12-2013','dd-mm-yyyy') as start_date, to_date('01-05-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('31-10-2014','dd-mm-yyyy') as start_date, to_date('15-11-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('01-10-2014','dd-mm-yyyy') as start_date, to_date('06-10-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('01-10-2014','dd-mm-yyyy') as start_date, to_date('05-10-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('01-10-2014','dd-mm-yyyy') as start_date, to_date('04-10-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('01-10-2014','dd-mm-yyyy') as start_date, to_date('03-10-2014','dd-mm-yyyy') as end_date from dual 
    ) 
select start_date, end_date from data 
where to_number(
    end_date - (case when start_date > to_date('01-01-2014','dd-mm-yyyy') 
    then start_date 
    else to_date('01-01-2014','dd-mm-yyyy') end) 
) > 4 


"START_DATE" "END_DATE" 
31-JAN-14 05-FEB-14 
31-DEC-13 01-MAY-14 
31-OCT-14 15-NOV-14 
01-OCT-14 06-OCT-14 

참고. 쿼리에 조건에 맞는 열을 추가하여 무슨 일이 벌어지고 있는지 확인하는 것이 좋습니다. 기준 값 표시하는 쿼리입니다 :

with data (start_date, end_date) 
    as (
    select to_date('31-01-2014','dd-mm-yyyy') as start_date, to_date('05-02-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('31-12-2013','dd-mm-yyyy') as start_date, to_date('01-01-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('31-12-2013','dd-mm-yyyy') as start_date, to_date('01-05-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('31-10-2014','dd-mm-yyyy') as start_date, to_date('15-11-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('01-10-2014','dd-mm-yyyy') as start_date, to_date('06-10-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('01-10-2014','dd-mm-yyyy') as start_date, to_date('05-10-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('01-10-2014','dd-mm-yyyy') as start_date, to_date('04-10-2014','dd-mm-yyyy') as end_date from dual 
    union all 
    select to_date('01-10-2014','dd-mm-yyyy') as start_date, to_date('03-10-2014','dd-mm-yyyy') as end_date from dual 
    ) 
select start_date, end_date, 
to_number(
    end_date - (case when start_date > to_date('01-01-2014','dd-mm-yyyy') 
    then start_date 
    else to_date('01-01-2014','dd-mm-yyyy') end)) as elapsed 
from data 
where to_number(
    end_date - (case when start_date > to_date('01-01-2014','dd-mm-yyyy') 
    then start_date 
    else to_date('01-01-2014','dd-mm-yyyy') end) 
) > 4 


"START_DATE" "END_DATE" "ELAPSED" 
31-JAN-14  05-FEB-14   5 
31-DEC-13  01-MAY-14  120 
31-OCT-14  15-NOV-14   15 
01-OCT-14  06-OCT-14   5 

반대의 기준이 일을 보장하기 위해, 나는이

where to_number(
    end_date - (case when start_date > to_date('01-01-2014','dd-mm-yyyy') 
    then start_date 
    else to_date('01-01-2014','dd-mm-yyyy') end) 
) <= 4 

에 기준을 변경하고 다시이있어 :

"START_DATE" "END_DATE" "ELAPSED" 
31-DEC-13  01-JAN-14   0 
01-OCT-14  05-OCT-14   4 
01-OCT-14  04-OCT-14   3 
01-OCT-14  03-OCT-14   2 

을