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Tried my best to understand task #4

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Tried my best to understand task #4

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38 changes: 38 additions & 0 deletions answer.sql
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Original file line number Diff line number Diff line change
@@ -1,7 +1,35 @@
-- TYPE YOUR SQL QUERY BELOW


-- I tried my best to understand the task but couldn't wrap my head around it. Wish there were more explanation

-- PART 1: Create a SQL query that maps out the daily average users before and after the feature change

-- Calculate daily average users before the feature change
SELECT
DATE(date_column) AS date,
AVG(users) AS daily_avg_users_before
FROM
user_activity
WHERE
date_column < 'feature_change_date'
GROUP BY
DATE(date_column)
ORDER BY
DATE(date_column);

-- Calculate daily average users after the feature change
SELECT
DATE(date_column) AS date,
AVG(users) AS daily_avg_users_after
FROM
user_activity
WHERE
date_column >= 'feature_change_date'
GROUP BY
DATE(date_column)
ORDER BY
DATE(date_column);



Expand All @@ -10,4 +38,14 @@



-- Count the number of status changes by card
SELECT
card_id,
COUNT(*) AS num_status_changes
FROM
card_status_changes
GROUP BY
card_id
ORDER BY
num_status_changes DESC;