Aysat
38 lines
924 B
SQL
38 lines
924 B
SQL
'''
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Задача 1.
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Таблица users
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| user_id | date |
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| --- | --- |
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| 1 | 2018-07-01 |
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| 234 | 2018-07-02 |
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| 3 | 2018-07-02 |
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| 1 | 2018-07-02 |
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| ... | ... |
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| 234 | 2018-10-04 |
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Нужно найти ежемесячное процентное изменение месячной аудитории активных пользователей.
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'''
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with monthly_users as (
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select count(distinct(user_id)) as active_users,
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date_trunc('month', date) as month
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from abakhytbekuly.users
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group by date_trunc('month', date)
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),
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change as (
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select active_users,
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month,
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lag(active_users) over(order by month) as prev_mau
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from monthly_users
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)
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select active_users,
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month,
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prev_mau,
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100.0 * (active_users - prev_mau) / prev_mau as pct_change -- тут результат странный типа '-66.666666'
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from change
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where prev_mau is not null
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order by month
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