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Non-Brand Data

Cornellius Yudha Wijaya, Josep Ferrer
Tens of paid subscribers

Non-Brand Data helps data professionals build practical judgment in ML, GenAI, and analytics through structured essays, field guides, templates, and applied workflows.

Platform
Substack
PricingFreemiumPublishesWeekly
Issues365Founded6 years agoLast Issue5 days ago
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Latest Issues

Module 5: Counting the right thing with GROUP BY

Let's learn how GROUP BY changes the result and why COUNT(*) doesn't always count the thing we need.

GROUP BY combines rows that have the same value and returns one result row for each group. We often use it with COUNT, SUM, or AVG to...

5 days ago
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Module 4: Finding the top results with ORDER BY and LIMIT

Let's learn how ORDER BY and LIMIT choose the top or bottom rows, and what to do when several rows tie at the cutoff.

ORDER BY decides how SQL arranges the rows, while LIMIT decides how many rows remain in the result. We need both when...

5 days ago
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Module 3: Filtering data with WHERE and NULL values

Let’s see how NULL values and time zones change the rows we get from a WHERE clause.

We use WHERE to choose which rows we want from a table. It is one of the first SQL clauses we learn, but the rows we get still depend on how we write the...

5 days ago
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I Have Worked in Data Science for Almost a Decade. These Skills Aged Better Than I Expected

I have worked in data science for almost a decade now. During that time, I have seen many tools become popular. There were Hadoop and Spark, followed by easier machine learning libraries, cloud platforms, and now generative AI tools that ca...

8 days ago
4

Module 2: SELECT and FROM: reading the table

Learn how to inspect a table, choose the columns you need, and understand what one row represents.

When we start working with a new table, SELECT * is often the first query we use. It shows the available columns and gives us a few rows to...

9 days ago
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Authors

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  • Cornellius Yudha Wijaya

    Sharing Data Knowledge to improve your values

  • Josep Ferrer

    Outstand using data -- Data Science, Design and Tech Tech Writer @KDnuggets @DataCamp \ud83d\udc49\ud83c\udffbInquiries in [email protected]

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