Data Cleaning Fundamentals with Spreadsheets and SQL

Learn to identify, clean, and verify messy data using SQL and spreadsheet formulas to prepare accurate datasets for analysis.

4.8 (1,129) ⏱ 59 min 📚 11 lessons 🎧 Audio version

About this course

Raw data is rarely ready for analysis, often containing duplicates, formatting errors, and missing values that can lead to incorrect business decisions. Learning how to systematically clean and validate this data is one of the most critical skills for any aspiring data professional. In this course, you will transition from handling messy, disorganized datasets to producing high-quality, analysis-ready data. You will master the fundamental techniques of data profiling, cleaning, and verification using industry-standard tools like spreadsheets and SQL, while also learning how to document your processes for transparency and reproducibility. What you'll learn: - Understand the foundational principles of data integrity, quality metrics, and the cost of dirty data. - Apply spreadsheet formulas and functions to standardize text, remove duplicates, and handle null values. - Write SQL queries to filter, transform, and clean large datasets stored in relational databases. - Implement modern data validation techniques to verify the accuracy and completeness of your cleaned data. - Document and report your data cleaning workflow to ensure transparency and reproducibility. - Practice data profiling to identify structural errors and anomalies before starting the cleaning process. The course begins with core definitions of data quality before guiding you through hands-on written explanations and code-based exercises in both spreadsheets and SQL. You will progress from simple formatting fixes to database cleaning operations and verification workflows. This course is designed for absolute beginners looking to build essential data preparation skills, with no prior data cleaning experience required. Start reading today to turn chaotic datasets into reliable, structured insights.

What you'll get

  • 📜 Certificate of completion
    Add it to your LinkedIn profile
  • 💬 Personal AI tutor
    Stuck on a lesson? Ask your built-in tutor anything, any time.
  • 🎧 Audio version included
    Learn on the go — no screen needed
  • ♾️ Lifetime access
    Come back anytime, no expiry
  • 📱 Phone or computer
    Works anywhere, any device
  • 💸 30-day refund
    No questions asked
  • Short & focused
    59 min of practical content

Reviews (6)

Ewa Mazur PL
★ 5 · 2025-12-25T08:55:07+00:00

Seriously impressed! The real-world examples made everything so clear. Definitely a valuable addition to my skillset.

Gustavo Teixeira BR
★ 3 · 2025-11-05T23:46:07+00:00

Really enjoyed the flow of this. The practical applications discussed were spot on. Great course!

Valentina Cruz CO Verified learner
★ 2 · 2025-10-23T04:03:07+00:00

Hmm, I'm not sure this is for absolute beginners. It assumes a bit of prior knowledge that wasn't explicitly taught. Some examples were confusing.

Ricardo Vargas MX
★ 3 · 2025-07-25T17:50:07+00:00

Really well-organized content. I appreciated the variety of examples used to explain things. Totally leveled up my understanding.

Henry Walker AU Verified learner
★ 4 · 2025-06-15T01:39:07+00:00

Thoroughly enjoyed this course. The way the information was presented was excellent, and the practical applications were highlighted effectively. Great job!

منصف بن علي TN Verified learner
★ 4 · 2025-03-19T09:14:07+00:00

A solid introduction to the topic. The examples provided were generally good, and the course is well-organized. Just wish some parts were explained a bit more thoroughly.

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Frequently asked

What do I need to take this course? +

Just a phone or computer with internet. No installs, no special hardware.

How do I pay? +

By card via Stripe, or with cryptocurrency. We do not store card details — Stripe handles them securely.

Can I get a refund? +

Yes — full refund within 30 days, no questions asked.

How long will I have access? +

Forever. Once you purchase, the course is yours to revisit anytime.

Will I get a certificate? +

Yes. On completion you'll receive a certificate you can add to your LinkedIn profile.

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