Question

我有一个关于Influxdb的查询，例如：

SELECT last("Shop1.balance")+last("Shop2.balance")+last("Shop2.balance") + last("Shop2.balance") FROM "balances" WHERE $timeFilter GROUP BY time($__interval) fill(previous)

我收到graphana所有商店的总余额。它工作正常，直到我添加一个带有新数据的新商店：历史中某个时间间隔的新商店余额可以为空，整个计算值将为空。我无法重新组织我的数据库，但可能是我可以更改我的查询以接收日期，其中空间隔将被视为总和为零。

Answer 1

这就像你问过的那样有效：

SELECT last("Shop1.balance") + last("Shop2.balance") + last("Shop3.balance)
FROM "balances" 
WHERE $timeFilter 
GROUP BY time($__interval) fill(0)

<强>演示

select last(balance1) as last_balance_1, last(balance2) as last_balance_2 
from balance 
where time > '2018-03-07T10:44:14.0000000Z' and time < '2018-03-07T10:44:52.0000000Z' 
group by time(7s)

结果：

name: balance
time                 last_balance_1 last_balance_2
----                 -------------- --------------
2018-03-07T10:44:13Z 1              2
2018-03-07T10:44:20Z 2              3
2018-03-07T10:44:27Z 4
2018-03-07T10:44:34Z 5              6
2018-03-07T10:44:41Z 7
2018-03-07T10:44:48Z 8              9

select last(balance1) as last_balance_1, last(balance2) as last_balance_2 
from balance 
where time > '2018-03-07T10:44:14.0000000Z' and time < '2018-03-07T10:44:52.0000000Z' 
group by time(7s) fill(0)

结果：

name: balance
time                 last_balance_1 last_balance_2
----                 -------------- --------------
2018-03-07T10:44:13Z 1              2
2018-03-07T10:44:20Z 2              3
2018-03-07T10:44:27Z 4              0
2018-03-07T10:44:34Z 5              6
2018-03-07T10:44:41Z 7              0
2018-03-07T10:44:48Z 8              9

将Null值视为零

1 个答案: