Clickhouse计算平均值

Question

我有两个字段，一个是时间戳，另一个是网络总和（以字节为单位）。

timestamp      network_in_bytes
1551196802144   1
1551196802145   5 
1551196802147   18 
1551196802158   80

我要计算（B> A）

avg_network_in_bytes=(network_in_bytes_B-network_in_bytes_A)/(timestamp_B-timestamp_A). 

如何获取avg_network_in_bytes？

Answer 1

查看此功能https://clickhouse.yandex/docs/ru/query_language/functions/other_functions/#runningdifference-x

您可以尝试执行以下操作：

select 
  timestamp,
  network_in_bytes,
  runningDifference(timestamp) as timestamp_diff,
  runningDifference(network_in_bytes) as bytes_diff,
  bytes_diff / timestamp_diff
from (
  select
    timestamp,
    network_in_bytes
  from table
  order by timestamp 
)