Anti-Join

Finding what is NOT there is harder than finding what is

Finding what is NOT there is harder than finding what is

Category

SQL

Difficulty

advanced

Duration

25 minutes

Challenges

0 hands-on challenges

Topics covered: "Users Who Never..." Is Always an Anti-Join, LEFT JOIN WHERE NULL vs NOT EXISTS vs NOT IN, The NOT IN NULL Trap, Multi-Column Anti-Joins, Performance: Hash Anti-Join vs Nested Loop

Lesson Sections

1. "Users Who Never..." Is Always an Anti-Join

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2. LEFT JOIN WHERE NULL vs NOT EXISTS vs NOT IN

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3. The NOT IN NULL Trap

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4. Multi-Column Anti-Joins

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5. Performance: Hash Anti-Join vs Nested Loop

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