如何解决时间戳总计
我有以下查询来计算总时间戳
SELECT SUM(TIME_SPENT) FROM
(
select a - b as time_spent from tbl1 where name = 'xxx'
union all
select c - d as time_spent from tbl2 where name= 'yyy'
)a;
子查询返回结果为 +00 00:01:54.252000 但是整个查询返回错误为ORA-00932:数据类型不一致:预期的NUMBER到INTERVAL DAY秒。
了解它需要这样的东西
SELECT COALESCE (
(to_timestamp('2014-09-22 16:00:00','yyyy/mm/dd HH24:MI:SS') - to_timestamp('2014-09-22 09:00:00','yyyy/mm/dd HH24:MI:SS')) -
(to_timestamp('2014-09-22 16:00:00','yyyy/mm/dd HH24:MI:SS')),INTERVAL '0' DAY) FROM DUAL;
如何与从Timestamp类型列中检索数据的子查询一起实现?
解决方法
您不能在Oracle中求和INTERVAL DAY TO SECOND
。我认为这是最受好评的开放功能请求之一。
您可以将TIMESTAMP
转换为DATE
值,然后得出的结果是天数差异。乘以24*60*60
就是想获得秒数:
SELECT SUM(TIME_SPENT) * 24*60*60 FROM FROM
(
select CAST(a AS DATE) - CAST(b AS DATE) as time_spent from tbl1 where name = 'xxx'
union all
select CAST(d AS DATE) - CAST(d AS DATE) as time_spent from tbl2 where name= 'yyy'
);
或者您可以编写将INTERVAL DAY TO SECOND
转换为秒的函数:
CREATE OR REPLACE FUNCTION GetSeconds(ds INTERVAL DAY TO SECOND) DETERMINISTIC RETURN NUMBER AS
BEGIN
RETURN EXTRACT(DAY FROM ds)*24*60*60
+ EXTRACT(HOUR FROM ds)*60*60
+ EXTRACT(MINUTE FROM ds)*60
+ EXTRACT(SECOND FROM ds);
END;
并像这样使用它:
SELECT SUM(TIME_SPENT),numtodsinterval(SUM(TIME_SPENT),'second')
(
select GetSeconds(a-b) as time_spent from tbl1 where name = 'xxx'
union all
select GetSeconds(c-d) as time_spent from tbl2 where name= 'yyy'
);
,
尝试使用以下查询
SELECT sum(extract(second from time_spent)) FROM
(
select a - b as time_spent from test2 where name = 'xxx'
union all
select c - d as time_spent from tbl2 where name= 'yyy'
)a;
好像time_spent列是表中的时间戳类型,并且它不能在Sum函数中传递正确的数据类型。使用提取功能从time_spent中获取秒。
,Users
└── clementbolin
└── go
└── src
├── main.go
└── src
└── function.go
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。