把几天变成几周、几个月、几年。ORACLE

Question

我有这个查询和结果：

SQL> select AVG(SYSDATE - DOB) AS AVERAGE_AGE_IN_DAYS
  2  FROM MORTAL;

AVERAGE_AGE_IN_DAYS
-------------------
           17877.44

有没有办法在同一查询中将其转换为年、月和日？

Answer 1

要获得月数，您可以使用months_between

SELECT select AVG(months_between(SYSDATE,DOB)) AS AVERAGE_AGE_IN_MONTHS

多年来，只做months_between/12

SELECT select AVG(months_between(SYSDATE,DOB)/12) AS AVERAGE_AGE_IN_YEARS

几个星期以来，我只会把你的结果数天，然后除以 7。

您可能必须处理结果以满足您的需求，但我认为这应该涵盖它。

Answer 2

怎么样：

select 
floor(months_between(SYSDATE,DOB)/12) AS years,
trunc( months_between(SYSDATE,DOB) ) AS months, 
SYSDATE - add_months( SYSDATE, trunc(months_between(SYSDATE,DOB)) ) AS days

正如细节所暗示的那样，这是年、月、日。 标题也说了几周，但如果你真的想要它们，我不是。

Answer 3

也许您的查询是：

with dates as (select AVG(SYSDATE - DOB) as d --average_in_days
                 from MORTAL
              )
select trunc(d/365) as years
     , trunc((d/365 - trunc(d/365)) * 12 ) as months
     , trunc((((d/365 - trunc(d/365)) * 12) - trunc((d/365 - trunc(d/365)) * 12 )) * 4.348214) as weeks     
     , trunc(((((d/365 - trunc(d/365)) * 12) - trunc((d/365 - trunc(d/365)) * 12 )) * 4.348214
                       - trunc((((d/365 - trunc(d/365)) * 12) - trunc((d/365 - trunc(d/365)) * 12 )) * 4.348214 )
             ) * 7 
             ) as days     
from dates;

Answer 4

CREATE FUNCTION time_spell(p_days VARCHAR2) RETURN VARCHAR2 IS
v_y NUMBER;
v_yd NUMBER;
v_m NUMBER;
v_md NUMBER;
v_d NUMBER;
v_w NUMBER;
v_wd NUMBER;
v_days NUMBER;
v_yi NUMBER;
v_mi NUMBER;
v_wi  NUMBER;
BEGIN
SELECT p_days/365 INTO v_y FROM dual;

if v_y not like '%.%' then
SELECT trunc(v_y) INTO v_yi FROM dual;
select substr(v_y||'.0',(select instr(v_y||'.0','.') from dual)) INTO v_yd from dual;
SELECT v_yd * 12 INTO v_m FROM dual;
SELECT trunc(v_m) INTO v_mi FROM dual;
select substr(v_m,(select instr(v_m,'.') from dual)) INTO v_md from dual;
SELECT v_md * 30 INTO v_d FROM dual;
SELECT v_d / 7 INTO v_w FROM dual;
SELECT trunc(v_w) INTO v_wi FROM dual;
select substr(v_w,(select instr(v_w,'.') from dual)) INTO v_wd from dual;
SELECT round(v_wd * 7) INTO v_days FROM dual;
RETURN v_yi||' Year(s) '||v_mi||' Month(s) '||v_wi||' Week(s) '||v_days||' Day(s) ';
else
SELECT trunc(v_y) INTO v_yi FROM dual;
select substr(v_y,(select instr(v_y,'.') from dual)) INTO v_yd from dual;
SELECT v_yd * 12 INTO v_m FROM dual;
SELECT trunc(v_m) INTO v_mi FROM dual;
select substr(v_m,(select instr(v_m,'.') from dual)) INTO v_md from dual;
SELECT v_md * 30 INTO v_d FROM dual;
SELECT v_d / 7 INTO v_w FROM dual;
SELECT trunc(v_w) INTO v_wi FROM dual;
select substr(v_w,(select instr(v_w,'.') from dual)) INTO v_wd from dual;
SELECT round(v_wd * 7) INTO v_days FROM dual;
RETURN v_yi||' Year(s) '||v_mi||' Month(s) '||v_wi||' Week(s) '||v_days||' Day(s) ';
end if;
END;

SELECT time_spell(17877.44) 来自双；