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create join table and remove subquery from insert

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This commit is contained in:
Francis Cao 2024-03-25 19:13:54 -07:00
parent d36bf4396a
commit c033b0582d
1 changed files with 32 additions and 11 deletions
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43
db/clickhouse/migrations/02_add_visit_id.sql
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@ -1,3 +1,22 @@
CREATE TABLE umami.website_event_join
(
session_id UUID,
visit_id UUID,
created_at DateTime('UTC')
)
engine = MergeTree
ORDER BY (session_id, created_at)
SETTINGS index_granularity = 8192;
INSERT INTO umami.website_event_join
SELECT DISTINCT
s.session_id,
generateUUIDv4() visit_id,
s.created_at
FROM (SELECT DISTINCT session_id,
date_trunc('hour', created_at) created_at
FROM website_event) s;
-- create new table
CREATE TABLE umami.website_event_new
(
@ -33,7 +52,7 @@ CREATE TABLE umami.website_event_new
INSERT INTO umami.website_event_new
SELECT we.website_id,
we.session_id,
we2.visit_id,
j.visit_id,
we.event_id,
we.hostname,
we.browser,
@ -56,15 +75,17 @@ SELECT we.website_id,
we.created_at,
we.job_id
FROM umami.website_event we
JOIN (SELECT DISTINCT
s.session_id,
generateUUIDv4() visit_id,
s.created_at
FROM (SELECT DISTINCT session_id,
date_trunc('hour', created_at) created_at
FROM umami.website_event) s) we2
ON we.session_id = we2.session_id
and date_trunc('hour', we.created_at) = we2.created_at;
JOIN umami.website_event_join j
ON we.session_id = j.session_id
and date_trunc('hour', we.created_at) = j.created_at
WHERE we.created_at > '2023-03-31';
RENAME TABLE umami.website_event TO umami.website_event_old;
RENAME TABLE umami.website_event_new TO umami.website_event;
RENAME TABLE umami.website_event_new TO umami.website_event;
/*
DROP TABLE umami.website_event_old
DROP TABLE umami.website_event_join
*/