Dataset pack

Customer phones with placeholders

Customer records where empty phone fields were filled with placeholders.

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 Placeholder text means missing.

customers 11 rows × 3 columns

Download customers.csv (Pro)

Data dictionary

id: Unique customer ID.
name: First name.
phone: Phone as typed, or a placeholder such as N/A.

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.