Sql 行之间的时间差之和
我有一个记录实体状态变化的表格Sql 行之间的时间差之和,sql,postgresql,aggregate-functions,window-functions,Sql,Postgresql,Aggregate Functions,Window Functions,我有一个记录实体状态变化的表格 id recordTime Status ID1 2014-03-01 11:33:00 Disconnected ID1 2014-03-01 12:13:00 Connected ID2 2014-03-01 12:21:00 Connected ID1 2014-03-01 12:24:00 Disconnected ID1 2014-03-01 12:29:00 Connected ID2 2014-03-01
id recordTime Status
ID1 2014-03-01 11:33:00 Disconnected
ID1 2014-03-01 12:13:00 Connected
ID2 2014-03-01 12:21:00 Connected
ID1 2014-03-01 12:24:00 Disconnected
ID1 2014-03-01 12:29:00 Connected
ID2 2014-03-01 12:40:00 Disconnected
ID2 2014-03-01 13:03:00 Connected
ID2 2014-03-01 13:13:00 Disconnected
ID2 2014-03-01 13:29:00 Connected
ID1 2014-03-01 13:30:00 Disconnected
我需要计算总非活动时间,即给定时间窗口内每个ID的“已连接”和上次“已断开”状态之间的时间
对于上表和2014-03-01 11:00:00至2014-03-01 14:00:00的时间范围,输出应为:
ID InactiveTime
ID1 01:15:00
ID2 02:00:00
但它输出:
"ID1";"00:45:00"
"ID2";"00:39:00"
我就是这样理解你的问题的
你能解释一下你想要的输出吗?特别的困难是不要错过到外部时间框架的时间跨度。 假设任何给定id的下一行始终具有相反的状态。 使用列名ts而不是recordTime: 按要求返回间隔。 所选时间范围内没有条目的ID不会显示。您必须另外查询它们 注意:我将结果total_转换为小提琴中的文本,因为类型间隔显示的格式很糟糕 在选定的时间范围内添加不带条目的ID 每一个请求在评论中。 在最终订单之前添加到上面的查询1:
现在,只有没有条目的ID在选定的时间范围内或之前没有出现。
您是否确信您的期望输出?是否保证下一行的任何给定ID具有相反的状态?@ Houial:输出是正确的,如果您考虑给定的时间范围2014-03-01 11:00到2014-03-01 14:00 00。@欧文,是的,每个条目的状态都会进行明确的切换。@ErwinBrandstetter-oups我看到:@Houari:也遗漏了相同的基本细节;正如欧文在他的回答中提到的,特别困难的是不要错过外部时间框架的时间跨度。如果我将时间范围从11:00更改为14:00,从13:00更改为14:00,为什么会显示混乱的结果?@Sandeep:我的第一个版本没有为时间范围之外的行做好准备。考虑更新版本的更新小提琴。这真的很快。谢谢!对于所选时间范围内没有条目的注释ID,不会显示。你必须另外询问他们,你的建议是什么?我的答案基本上是你的一个增强版,它也考虑了在所选列表中没有条目的ID,你觉得我的答案怎么样time@Sandeep请考虑这个附录。"ID1";"00:45:00"
"ID2";"00:39:00"
select id, sum(diff) as inactive
from (
select
recordtime,
recordTime -
lag(recordTime, 1, recordTime)
over(
partition by id
order by recordTime
)
as diff,
status,
id
from t
) s
where status = 'Connected'
group by id
order by id
;
id | inactive
----+----------
1 | 00:45:00
2 | 00:39:00
WITH span AS (
SELECT '2014-03-01 13:00'::timestamp AS s_from -- start of time range
, '2014-03-01 14:00'::timestamp AS s_to -- end of time range
)
, cte AS (
SELECT id, ts, status, s_to
, lead(ts, 1, s_from) OVER w AS span_start
, first_value(ts) OVER w AS last_ts
FROM span s
JOIN tbl t ON t.ts BETWEEN s.s_from AND s.s_to
WINDOW w AS (PARTITION BY id ORDER BY ts DESC)
)
SELECT id, sum(time_disconnected)::text AS total_disconnected
FROM (
SELECT id, ts - span_start AS time_disconnected
FROM cte
WHERE status = 'Connected'
UNION ALL
SELECT id, s_to - ts
FROM cte
WHERE status = 'Disconnected'
AND ts = last_ts
) sub
GROUP BY 1
ORDER BY 1;
...
UNION ALL
SELECT id, total_disconnected
FROM (
SELECT DISTINCT ON (id)
t.id, t.status, (s.s_to - s.s_from)::text AS total_disconnected
FROM span s
JOIN tbl t ON t.ts < s.s_from -- only from before time range
LEFT JOIN cte c USING (id)
WHERE c.id IS NULL -- not represented in selected time frame
ORDER BY t.id, t.ts DESC -- only the latest entry
) sub
WHERE status = 'Disconnected' -- only if disconnected
ORDER BY 1;