计算时间戳差异 - 超过 48 小时不起作用

【问题标题】：Calculating Timestamp difference - doesnt work beyond 48 hours计算时间戳差异 - 超过 48 小时不起作用
【发布时间】：2017-10-30 11:55:06
【问题描述】：

我正在计算两个时间戳之间的差异，当差异超过 48 小时时，这在某种程度上不起作用。

这是我的代码： select systimestamp, mystoredtimestamp, extract( hour from diff ) || ' hours ' || extract( minute from diff ) || ' minutes' from (select (systimestamp - mystoredtimestamp)) diff from dual)

输出是

1. systimestamp: 30-OCT-17 11.48.43.783572 AM +00:00,
2. mystoredtimestamp: 27-OCT-17 07.30.36.956687 AM,
3. difference: 4 hours 18 minutes

（不知怎的，这个markdown编号没有被渲染，上面是查询的三个不同的列）

mystoredtimestamp 是 TIMESTAMP(6) WITH LOCAL TIME ZONE 数据类型。那是导致问题的原因吗？如果是这样，我现在该如何解决？

【问题讨论】：

标签： oracle plsql oracle-apex oracle-apex-5

【解决方案1】：

您还需要提取天数。它不会自动转换为小时数。

SELECT
  extract ( DAY FROM diff )
  || ' days '
  ||extract( hour FROM diff )
  || ' hours '
  || extract( minute FROM diff )
  || ' minutes'
FROM
  (
    SELECT
      systimestamp - CAST ( '27-OCT-17 07.30.36.956687 AM' AS TIMESTAMP(6)
      WITH LOCAL TIME ZONE ) diff
    FROM
      DUAL
  );

O/p

3 days 2 hours 26 minutes

如果您希望以小时为单位，请乘以 24 并加上天数。

SELECT
  24 * extract ( DAY FROM diff )
   +
 extract( hour FROM diff )
  || ' hours '
  || extract( minute FROM diff )
  || ' minutes'
FROM
  (
    SELECT
      systimestamp - CAST ( '27-OCT-17 07.30.36.956687 AM' AS TIMESTAMP(6)
      WITH LOCAL TIME ZONE ) diff
    FROM
      DUAL
  );

O/p

74 hours 28 minutes

【讨论】：