什么SQL表达式能够计算任何特定年份的秒数?
答案 0 :(得分:2)
对于非闰年:
SELECT 365 * 24 * 60 * 60 AS secInYear
FROM dual
总的来说:
<强> SqlFiddleDemo
SELECT
24 * 60 * 60 * (
CASE
WHEN MOD(EXTRACT(YEAR FROM sysdate), 400) = 0
OR ( MOD(EXTRACT(YEAR FROM sysdate), 4) = 0 AND MOD(EXTRACT(YEAR FROM sysdate), 100) != 0) THEN 366
ELSE 365
END ) AS secInYear
FROM dual
答案 1 :(得分:1)
SELECT
(ADD_MONTHS(TRUNC(SYSDATE, 'YYYY'), 12) - TRUNC(SYSDATE, 'YYYY')) * 86400 SECONDS
FROM
DUAL;
答案 2 :(得分:0)
SELECT DAYOFYEAR('2015-12-31') * 24 * 60 * 60 FROM DUAL
DAYOFYEAR
常规年将为新年前夜返回365,闰年将为366。