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Generative AI FoundationsAI · 9 lessonsSQL FoundationsSQL · 4 lessonsPython FoundationsPython · 6 lessonsExcel FoundationsExcel · 6 lessonsR for AnalysisR · 6 lessonsData Engineering FoundationsData Engineering · 6 lessons

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SQLPYML

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top_customers.sql
SELECT name, count(*)
FROM orders
GROUP BY name;
3 / 3 tests passed

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Why does a LEFT JOIN keep NULLs?
It keeps every row from the left table. Where the right side has no match, those columns come back empty rather than dropping the row.
LESSON 3 · JOINING DATA IN SQL

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