Data Cleaning Exercises

Dataset pack

Incremental change extract

Rows changed around the previous run's high-water mark, stamped 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 Load only rows after the high-water mark.

events 19 rows × 3 columns

Download events.csv (Pro)

Data dictionary

id
Unique row ID.
updated_at
Last change, ISO 8601 with offset.
amount
Amount as text.

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.