SELECT | |
sum(view_homepage) AS viewed_homepage, | |
sum(enter_credit_card) AS entered_credit_card | |
FROM ( | |
-- Get the first time each user viewed the homepage. | |
SELECT | |
user_id, | |
1 AS view_homepage, | |
min(time) AS view_homepage_time | |
FROM event | |
WHERE | |
data->>'type' = 'view_homepage' | |
GROUP BY user_id | |
) e1 LEFT JOIN LATERAL ( | |
-- For each (user_id, view_homepage_time) tuple, get the first time that | |
-- user did the enter_credit_card event, if one exists within two weeks. | |
SELECT | |
1 AS enter_credit_card, | |
time AS enter_credit_card_time | |
FROM event | |
WHERE | |
user_id = e1.user_id AND | |
data->>'type' = 'enter_credit_card' AND | |
time BETWEEN view_homepage_time AND (view_homepage_time + 1000*60*60*24*14) | |
ORDER BY time | |
LIMIT 1 | |
) e2 ON true |
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ltenzil commentedOct 1, 2018
Hi @drob, thanks for the post of lateral join, by any chance, you made any video?