runtimetask Cohorts & retention · hard
Next-month retention by signup cohort
For users created from January to May 2025, return cohort_month (YYYY-MM of created_at), cohort_size (users in the cohort), retained (users with any event in the calendar month after their cohort month) and retention_pct (0–100, 2 decimals).
what to return
- Columns
cohort_monthcohort_sizeretainedretention_pctin this order- Rows
- 5 rows · any order
- Watch for
- Use occurred_at for activity.
- June 2025 is the last complete month, so the May cohort is the newest mature cohort.
- Skill
- Measure the share of a cohort active in the following month. Refresher: Cohorts & exact-day retention →
expected result
Your query should return exactly these columns and values. Run it and compare.
expected result5 rows · any order
| cohort_month | cohort_size | retained | retention_pct |
|---|---|---|---|
| 2025-01 | 919 | 384 | 41.78 |
| 2025-02 | 863 | 377 | 43.68 |
| 2025-03 | 1086 | 431 | 39.69 |
first 3 of 5 rows
data you can query
Product / SaaS Analytics dataset: the first 6 rows of each table. Under each column name: the kind of value it holds, and which table it links to. Your queries run on all rows.
users9 columns · 11,348 rows
| user_idnumber · unique id | account_idnumber · links to accounts | full_nametext | emailtext | roletext | signup_sourcetext | referred_by_user_idnumber · links to users | created_atdate & time | deactivated_attext |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 | Omar Jackson | omar.jackson@ironcapital1.example | owner | workspace_creator | NULL | 2024-01-14 18:52:14 | NULL |
| 2 | 1 | Imani Kang | imani.kang@ironcapital1.example | admin | invitation | NULL | 2024-01-24 03:43:14 | NULL |
| 3 | 1 | Chloe Mitchell | chloe.mitchell@ironcapital1.example | admin | invitation | NULL | 2024-02-02 21:34:25 | NULL |
| 4 | 1 | Jaya Carter | jaya.carter@ironcapital1.example | member | domain_join | NULL | 2024-03-31 03:39:32 | NULL |
| 5 | 1 | Zoe Turner | zoe.turner@ironcapital1.example | member | domain_join | NULL | 2024-02-12 02:53:31 | NULL |
| 6 | 2 | Esther Smith | esther.smith@vectordata2.example | owner | workspace_creator | NULL | 2024-01-15 13:21:52 | NULL |
- user_idnumber · unique id
- 1
- account_idnumber · links to accounts
- 1
- full_nametext
- Omar Jackson
- emailtext
- omar.jackson@ironcapital1.example
- roletext
- owner
- signup_sourcetext
- workspace_creator
- referred_by_user_idnumber · links to users
- NULL
- created_atdate & time
- 2024-01-14 18:52:14
- deactivated_attext
- NULL
- user_idnumber · unique id
- 2
- account_idnumber · links to accounts
- 1
- full_nametext
- Imani Kang
- emailtext
- imani.kang@ironcapital1.example
- roletext
- admin
- signup_sourcetext
- invitation
- referred_by_user_idnumber · links to users
- NULL
- created_atdate & time
- 2024-01-24 03:43:14
- deactivated_attext
- NULL
- user_idnumber · unique id
- 3
- account_idnumber · links to accounts
- 1
- full_nametext
- Chloe Mitchell
- emailtext
- chloe.mitchell@ironcapital1.example
- roletext
- admin
- signup_sourcetext
- invitation
- referred_by_user_idnumber · links to users
- NULL
- created_atdate & time
- 2024-02-02 21:34:25
- deactivated_attext
- NULL
- user_idnumber · unique id
- 4
- account_idnumber · links to accounts
- 1
- full_nametext
- Jaya Carter
- emailtext
- jaya.carter@ironcapital1.example
- roletext
- member
- signup_sourcetext
- domain_join
- referred_by_user_idnumber · links to users
- NULL
- created_atdate & time
- 2024-03-31 03:39:32
- deactivated_attext
- NULL
- user_idnumber · unique id
- 5
- account_idnumber · links to accounts
- 1
- full_nametext
- Zoe Turner
- emailtext
- zoe.turner@ironcapital1.example
- roletext
- member
- signup_sourcetext
- domain_join
- referred_by_user_idnumber · links to users
- NULL
- created_atdate & time
- 2024-02-12 02:53:31
- deactivated_attext
- NULL
- user_idnumber · unique id
- 6
- account_idnumber · links to accounts
- 2
- full_nametext
- Esther Smith
- emailtext
- esther.smith@vectordata2.example
- roletext
- owner
- signup_sourcetext
- workspace_creator
- referred_by_user_idnumber · links to users
- NULL
- created_atdate & time
- 2024-01-15 13:21:52
- deactivated_attext
- NULL
first 6 of 11,348 rows · your queries use all of them
events8 columns · 135,428 rows
| delivery_idnumber · unique id | event_idtext | user_idnumber · links to users | account_idnumber · links to accounts | session_idnumber · links to sessions | event_nametext | occurred_atdate & time | received_atdate & time |
|---|---|---|---|---|---|---|---|
| 1 | evt_0000001 | 1 | 1 | 1 | user_signed_up | 2024-01-14 18:52:14 | 2024-01-14 18:52:33 |
| 2 | evt_0000002 | 1 | 1 | 1 | onboarding_started | 2024-01-14 18:52:51 | 2024-01-14 18:53:06 |
| 3 | evt_0000084 | 6 | 2 | 32 | user_signed_up | 2024-01-15 13:21:52 | 2024-01-15 13:22:00 |
| 4 | evt_0000085 | 6 | 2 | 32 | onboarding_started | 2024-01-15 13:22:05 | 2024-01-15 13:22:16 |
| 5 | evt_0000086 | 6 | 2 | 32 | onboarding_completed | 2024-01-15 13:23:52 | 2024-01-15 13:24:12 |
| 6 | evt_0000019 | 1 | 1 | 9 | search_performed | 2024-01-17 20:56:55 | 2024-01-17 20:56:59 |
- delivery_idnumber · unique id
- 1
- event_idtext
- evt_0000001
- user_idnumber · links to users
- 1
- account_idnumber · links to accounts
- 1
- session_idnumber · links to sessions
- 1
- event_nametext
- user_signed_up
- occurred_atdate & time
- 2024-01-14 18:52:14
- received_atdate & time
- 2024-01-14 18:52:33
- delivery_idnumber · unique id
- 2
- event_idtext
- evt_0000002
- user_idnumber · links to users
- 1
- account_idnumber · links to accounts
- 1
- session_idnumber · links to sessions
- 1
- event_nametext
- onboarding_started
- occurred_atdate & time
- 2024-01-14 18:52:51
- received_atdate & time
- 2024-01-14 18:53:06
- delivery_idnumber · unique id
- 3
- event_idtext
- evt_0000084
- user_idnumber · links to users
- 6
- account_idnumber · links to accounts
- 2
- session_idnumber · links to sessions
- 32
- event_nametext
- user_signed_up
- occurred_atdate & time
- 2024-01-15 13:21:52
- received_atdate & time
- 2024-01-15 13:22:00
- delivery_idnumber · unique id
- 4
- event_idtext
- evt_0000085
- user_idnumber · links to users
- 6
- account_idnumber · links to accounts
- 2
- session_idnumber · links to sessions
- 32
- event_nametext
- onboarding_started
- occurred_atdate & time
- 2024-01-15 13:22:05
- received_atdate & time
- 2024-01-15 13:22:16
- delivery_idnumber · unique id
- 5
- event_idtext
- evt_0000086
- user_idnumber · links to users
- 6
- account_idnumber · links to accounts
- 2
- session_idnumber · links to sessions
- 32
- event_nametext
- onboarding_completed
- occurred_atdate & time
- 2024-01-15 13:23:52
- received_atdate & time
- 2024-01-15 13:24:12
- delivery_idnumber · unique id
- 6
- event_idtext
- evt_0000019
- user_idnumber · links to users
- 1
- account_idnumber · links to accounts
- 1
- session_idnumber · links to sessions
- 9
- event_nametext
- search_performed
- occurred_atdate & time
- 2024-01-17 20:56:55
- received_atdate & time
- 2024-01-17 20:56:59
first 6 of 135,428 rows · your queries use all of them
solution.sql
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