Multi-Table Joins

The five-table join question tests whether you think in cardinality

The five-table join question tests whether you think in cardinality

Category

SQL

Difficulty

advanced

Duration

25 minutes

Challenges

0 hands-on challenges

Topics covered: Drawing the Join Graph Before Writing SQL, Join Order and the Fan-Out Trap, LEFT vs INNER at Each Hop, Bridge Tables and Many-to-Many, Talking Through the Join in an Interview

Lesson Sections

1. Drawing the Join Graph Before Writing SQL

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2. Join Order and the Fan-Out Trap

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3. LEFT vs INNER at Each Hop

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4. Bridge Tables and Many-to-Many

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5. Talking Through the Join in an Interview

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