如何在DB2中获得以天为单位的两个时间戳之间的精确差异。我的意思是，如果一个日期是FROM_DATE = 5/6/2015 2：22：27.000000 PM和TO_DATE = 3/30/2015 2：33：52.000000 PM，则时间戳记差异应显示36天。我尝试在下面使用
((24*DAYS(From_Date)+MIDNIGHT_SECONDS(From_Date)/3600) -
(24*DAYS(To_Date)+MIDNIGHT_SECONDS(To_Date)/3600))/(24)
但这给了我37天的时间。
那
SELECT days_between ('2015-05-06-02.22.27.000000','2015-03-30-02.33.52.000000')
FROM SYSIBM.sysdummy1
返回36。
,错误的公式。查看以下内容。
SELECT
FROM_DATE,TO_DATE,(
(24*DAYS(From_Date)+MIDNIGHT_SECONDS(From_Date)/3600)
- (24*DAYS(To_Date)+MIDNIGHT_SECONDS(To_Date)/3600)
)/24 AS D1,(
(DAYS(From_Date)*bigint(86400) + MIDNIGHT_SECONDS(From_Date))
- (DAYS(To_Date) *bigint(86400) + MIDNIGHT_SECONDS(To_Date))
)/86400 AS D2
FROM
(
VALUES
(TIMESTAMP('2015-05-06-14.22.27'),TIMESTAMP('2015-03-30-14.33.52')),(TIMESTAMP('2015-03-31-14.22.27'),(TIMESTAMP('2015-04-01-14.22.27'),TIMESTAMP('2015-03-30-14.33.52'))
) T(FROM_DATE,TO_DATE);
|FROM_DATE |TO_DATE |D1 |D2 |
|--------------------------|--------------------------|-----------|--------------------|
|2015-05-06-14.22.27.000000|2015-03-30-14.33.52.000000|37 |36 |
|2015-03-31-14.22.27.000000|2015-03-30-14.33.52.000000|1 |0 |
|2015-04-01-14.22.27.000000|2015-03-30-14.33.52.000000|2 |1 |