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목록left join (1)
RE:cord
[SQL] Count the number of group (GROUP BY / JOIN / LEFT JOIN / SUM)
-- subQ: Only MacBookPro user's data-- mainQ: event name, event freq -> DESC orderSELECT event_name, COUNT(event_name) AS event_freqFROM (SELECT * FROM playbook_events WHERE device = 'macbook pro') AS MBP_userGROUP BY event_nameORDER BY event_freq DESC; --1.left join with 'host_id'--2.make group by 'nationality'--3.count n_beds of each groups--4. sort avail_beds DESCSELECT nati..
SQL
2024. 11. 27. 13:03