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Daily Retention by Genre SQL
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Daily Retention by Genre SQL

MediumSQL · PostgreSQL

Problem

Write a query to calculate the daily retention rate of users who watched a specific genre of content.

For this exercise, use Drama as the specific genre and define retention as watching any content on the following calendar day. Include every day with at least one qualifying genre viewer.

Output

  1. One row per cohort date, with watched_date, cohort_users, retained_users, and daily_retention_rate.
  2. Include each qualifying viewer once per date, calculate the rate as retained users divided by cohort users, and return the rate rounded to four decimal places.
  3. Order by watched_date ascending.

Schema

content
ColumnTypeDescription
content_idPKINTUnique content identifier
titleVARCHAR(150)Content title
genreVARCHAR(50)Primary content genre
viewing_events
ColumnTypeDescription
event_idPKINTUnique viewing event identifier
user_idVARCHAR(40)Viewer identifier
content_idINTViewed content identifier
watched_atTIMESTAMPTimestamp when viewing occurred
Tablescontentviewing_events
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Your question is Daily Retention by Genre SQL. Start with the requirements and the two tables in the Question tab.

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