Dataset pack
Duplicated contacts
Contacts entered several times, where newer copies sometimes lost the phone number.
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 Prefer the most complete record.
contacts 14 rows × 4 columns
Download contacts.csv (Pro)Data dictionary
- id
- Unique record ID.
- Email as entered.
- phone
- Phone number; may be blank.
- updated
- Date the record was last updated.
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.