User Life Cycle SQL Query Logic in Snowflake

Question

I am working on building a query to track the life cycle of an user through the platform via events. The table EVENTS has 3 columns USER_ID, DATE_TIME and EVENT_NAME. Below is a snapshot of the table,

My query should return the below result (the first timestamp for the registered event followed by the immediate/next timestamp of the following log_in event and finally followed by the immediate/next timestamp of the final landing_page event),

Below is my query ,

WITH FIRST_STEP AS
(SELECT 
USER_ID,
MIN(CASE WHEN EVENT_NAME = 'registered' THEN DATE_TIME ELSE NULL END) AS REGISTERED_TIMESTAMP
FROM EVENTS
GROUP BY 1
),
SECOND_STEP AS
(SELECT * FROM EVENTS
WHERE EVENT_NAME = 'log_in'
ORDER BY DATE_TIME
),
THIRD_STEP AS
(SELECT * FROM EVENTS
WHERE EVENT_NAME = 'landing_page'
ORDER BY DATE_TIME
)
SELECT
a.USER_ID,
a.REGISTERED_TIMESTAMP,
(SELECT
CASE WHEN b.DATE_TIME >= a.REGISTRATIONS_TIMESTAMP THEN b.DATE_TIME END AS LOG_IN_TIMESTAMP
FROM SECOND_STEP
LIMIT 1
),
(SELECT
CASE WHEN c.DATE_TIME >= LOG_IN_TIMESTAMP THEN c.DATE_TIME END AS LANDING_PAGE_TIMESTAMP
FROM THIRD_STEP
LIMIT 1
)
FROM FIRST_STEP AS a
LEFT JOIN SECOND_STEP AS b ON a.USER_ID = b.USER_ID
LEFT JOIN THIRD_STEP AS c ON b.USER_ID = c.USER_ID;

Unfortunately I am getting the "SQL compilation error: Unsupported subquery type cannot be evaluated" error when I try to run the query

user_132438 · Answer

This is a perfect use case for MATCH_RECOGNIZE.

The pattern you are looking for is register anything* login anything* landing and the measures are the min(iff(event_name='x', date_time, null)) for each.

Check:

Set the output to one row per match.

Untested sample query:

select *
from data
match_recognize(
    partition by user_id
    order by date_time
    measures min(iff(event_name='register', date_time, null)) as t1
      , min(iff(event_name='log_in', date_time, null)) as t2
      , min(iff(event_name='landing_page', date_time, null)) as t3
    one row per match
    pattern(register anything* login anything* landing)
    define
        register as event_name = 'register'
        , login as event_name = 'log_in'
        , landing as event_name = 'landing_page'
);

User Life Cycle SQL Query Logic in Snowflake

1 Answers