Data Cleaning Exercises

Dataset pack

Sales, products and categories

Sales linked to a product list, which is linked to a category list that lost some codes.

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 Two-level referential integrity.

sales 15 rows × 2 columns

Download sales.csv (Pro)

Data dictionary

id
Unique sale ID.
sku
SKU as typed.

products 6 rows × 2 columns

Download products.csv (Pro)

Data dictionary

sku
Product SKU (upper case, unique).
category_code
Category code; may be missing or retired.

categories 3 rows × 2 columns

Download categories.csv (Pro)

Data dictionary

code
Category code (unique).
department
Department the category belongs to.

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.