Dataset pack
Contacts with optional phones
Contacts duplicated by email and phone, where many rows have no phone.
Fictional data · UTF-8 CSV, every value quoted so padding and leading zeros survive; empty fields are missing values · free for personal and classroom practice · practise it in Missing values group together.
contacts 16 rows × 3 columns
Download contacts.csv (Pro)Data dictionary
- id
- Unique contact ID.
- Email as typed.
- phone
- Phone as typed (optional).
Values are shown in quotes so leading and trailing spaces are visible. ∅ means the cell is missing. Exercises are also graded on hidden datasets that are never published.