Non-Brand Data

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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.
 • Cornellius Yudha Wijaya
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.
 • Cornellius Yudha Wijaya
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.
 • Cornellius Yudha Wijaya
I Have Worked in Data Science for Almost a Decade. These Skills Aged Better Than I Expected
The tools changed much faster than the work underneath them*
 • Cornellius Yudha Wijaya
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.
 • Cornellius Yudha Wijaya
Module 1: Getting the question right before writing SQL
Learn how to define the population, metric, and time window before you write a query.
 • Cornellius Yudha Wijaya
SQL and Analytics course
Certificate Available! Learn how to define metrics, check your analysis, and explain the result in the era of AI.
 • Cornellius Yudha Wijaya

August 2026

July 2026

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