[英]Calculate bounce rate with Clickhouse
I am trying to use Clickhouse for a small analytics app of mine and I have a table that records raw hits as:我正在尝试将 Clickhouse 用于我的一个小型分析应用程序,并且我有一个表格,将原始点击记录为:
CREATE TABLE hits (
sessionId LowCardinality(String),
page LowCardinality(String),
timestamp DateTime,
projectId UInt16
) ENGINE = MergeTree() PARTITION BY toYYYYMM(timestamp)
ORDER BY (projectId, page, toStartOfHour(timestamp)) --
SETTINGS index_granularity = 8192;
Afterwards I can add some sample data as:之后我可以添加一些示例数据:
sessionId page timestamp projectId
xxx / 2021-03-12 13:51:12 1
yyy / 2021-03-12 13:51:12 1
xxx /cool 2021-03-12 13:52:12 1
fff / 2021-03-12 13:53:12 1
What I am trying to achieve is calculating bounces (unique sessionId occurunce) and views per page, something like:我想要实现的是计算跳出(唯一的 sessionId 发生)和每页的浏览量,例如:
page bounces views projectId
/ 2 3 1
/cool 0 1 1
I can easily count the views per page but the unique sessionId
counting is failing due to the GROUP BY
clause:我可以轻松计算每页的浏览量,但由于GROUP BY
子句,唯一sessionId
计数失败:
SELECT page,
projectId,
count(*) as views,
count(DISTINCT sessionId) as bounces --fail
from hits
GROUP BY (page, projectId);
Any ideas, workarounds on changing the Clickhouse schema or even using some of engine from Clickhouse for aggregation would be highly appreciated.任何关于更改 Clickhouse 架构甚至使用 Clickhouse 的某些引擎进行聚合的想法、解决方法都将受到高度赞赏。
check https://clickhouse.tech/docs/en/sql-reference/aggregate-functions/parametric-functions/#function-sequencecount检查https://clickhouse.tech/docs/en/sql-reference/aggregate-functions/parametric-functions/#function-sequencecount
select projectId, p[1] page, countIf(length(p)=1) bounce
from (
SELECT
projectId, sessionId,
groupArray( page ) p
from hits
GROUP BY sessionId, projectId )
group by projectId,page
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