SQLSQL LabPostgreSQL practice
00:0037 / 45
T05IntermediateCOUNT DISTINCT · time buckets

Daily active customers

Return event_day and active_customers for days from 2026-08-01 onward. A customer is active if it emitted any event. Sort chronologically.

Data available

Use this table

1 table
Table 1

usage_events

Product events with late and duplicate source records.

  • event_idintegerPK
  • source_event_idtext
  • user_idintegerFK
  • customer_idintegerFK
  • event_typetext
  • occurred_attimestamptz
  • ingested_attimestamptz
  • duration_msintegerNULL
  • metadatajsonb
Query editor

PostgreSQL

⌘↵ Run query
Result stream

Output

Run your query to inspect its result.
Contextual coach

Ask about this attempt

Run or check a query first. The coach only comments on a real error or grader mismatch.

Field notes

Hints & explanation

Try to solve it cold. Two progressive hints are available.