Data Cleaning Exercises

Dataset pack

Audit log across time zones

Audit events stamped by servers in several time zones.

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 An audit log in true time order.

audit 17 rows × 4 columns

Download audit.csv (Pro)

Data dictionary

id
Unique event ID.
actor
Who acted.
action
What happened.
at
When, ISO 8601 with offset.

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.