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SELECT
user_id,
view_homepage,
view_homepage_time,
enter_credit_card,
enter_credit_card_time
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 row, get the first time the user_id did the enter_credit_card
-- event, if one exists within two weeks of view_homepage_time.
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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