8 - Exercise Summary

✅ What you built

• A column expectation (is_in) in your flight_alerts_clean transform code.
• A group-by expectation (is_unique) in your flight_alerts_joined_passengers transform code.
• A schema expectation check on your flight_alerts_by_country transform generator code.

✅ What you learned

1. A check requires at least three arguments:

   • the expectation itself (which you can pull from the documentation)
   • an arbitrary check name in single quotes (e.g., 'My Primary Key Uniqueness Check')
   • an on_error behavior of 'FAIL' or 'WARN'.

2. You must manually subscribe to data expectations checks in the Data Health application.