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Relationships and Analysis
Pause here and make sure the main ideas feel clear before moving to the next chapter.
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What you should understand now
Connect tables and summarize data without duplicating it.
Primary and foreign keys
Model relationships between records.
INNER and LEFT JOIN
Combine related rows from separate tables.
GROUP BY and aggregates
Summarize many rows into useful measures.
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Before you move on
Use this quick review if anything still feels unclear.
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