Data cleaning and quality · Beginner · 4 h

A data quality checklist

Completeness, validity, consistency, uniqueness and timeliness, checked with a handful of queries.

Why employers care: Named in 44% of the Data Analyst and 66% of the Data Engineer job descriptions we read. Wrong numbers in a dashboard cost trust that takes months to rebuild.

In the roadmaps for: Data Analyst, Data Scientist, Data Engineer