我需要显示自特定日期以来经过的时间,包括年,月和日,考虑闰年/月数。这必须在Firebird 2.1中存储的产品中。
我正在努力解决以下问题:
SELECT CASE
WHEN :CustomDateTime > CURRENT_DATE THEN 0
WHEN EXTRACT(YEARDAY FROM :CustomDateTime) > EXTRACT(YEARDAY FROM CURRENT_DATE) THEN DATEDIFF(YEAR, :CustomDateTime, CURRENT_DATE) - 1
ELSE DATEDIFF(YEAR, :CustomDateTime, CURRENT_DATE)
END
FROM RDB$DATABASE
INTO :YearDiff;
SELECT CASE
WHEN :CustomDateTime > CURRENT_DATE THEN 0
WHEN (EXTRACT(MONTH FROM :CustomDateTime) = EXTRACT(MONTH FROM CURRENT_DATE))
AND (EXTRACT(YEARDAY FROM :CustomDateTime) > EXTRACT(YEARDAY FROM CURRENT_DATE))
THEN DATEDIFF(MONTH, DATEADD(:YearDiff YEAR TO :CustomDateTime), CURRENT_DATE) - 1
ELSE DATEDIFF(MONTH, DATEADD(:YearDiff YEAR TO :CustomDateTime), CURRENT_DATE)
END
FROM RDB$DATABASE
INTO :MonthDiff;
SELECT CASE
WHEN :CustomDateTime > CURRENT_DATE THEN 0
WHEN (:YearDiff > 0) AND (:MonthDiff > 0) THEN DATEDIFF(DAY, DATEADD(:MonthDiff MONTH TO DATEADD(:YearDiff YEAR TO :CustomDateTime)), CURRENT_DATE)
WHEN (:YearDiff > 0) AND (:MonthDiff = 0) THEN DATEDIFF(DAY, DATEADD(:YearDiff YEAR TO :CustomDateTime), CURRENT_DATE)
WHEN (:YearDiff = 0) AND (:MonthDiff > 0) THEN DATEDIFF(DAY, DATEADD(:MonthDiff MONTH TO :CustomDateTime), CURRENT_DATE)
ELSE DATEDIFF(DAY, :CustomDateTime, CURRENT_DATE)
END
FROM RDB$DATABASE
INTO :DayDiff;
关于如何修复它的任何想法?
答案 0 :(得分:0)
这是在pl / sql中,但您可以使用这个想法来查找自v_date以来经过的时间;
set serveroutput on;
declare
v_date date := '27-APR-16';
PROCEDURE passed(toCheck date) IS
years INTEGER := 0;
months INTEGER := 0;
days INTEGER := 0;
BEGIN
SELECT floor(MONTHS_BETWEEN(sysdate, toCheck)) into months FROM dual;
SELECT SYSDATE - ADD_MONTHS(toCheck, months) INTO days FROM dual;
years := floor(months / 12);
months := months - (years * 12);
dbms_output.put_line('Yers : ' || years || ', ' || ' Months : ' || months || ', Days: ' || days);
END passed;
begin
passed(v_date);
end;