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LeetCode-Solutions/MySQL/active-businesses.sql at master · feiyunwill/LeetCode-Solutions · GitHub
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active-businesses.sql
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active-businesses.sql
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#
Time: O(n)
#
Space: O(n)
SELECT
business_id
FROM
EVENTS
JOIN
(
SELECT
event_type,
avg
(occurences)
AS
average
FROM
EVENTS
GROUP BY
event_type)
AS
TEMP
ON
Events
.
event_type
=
temp
.
event_type
AND
Events
.
occurences
>
temp
.
average
GROUP BY
business_id
HAVING
count
(DISTINCT
Events
.
event_type
)
>
1
ORDER BY
NULL
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