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1. Commits on Sep 2, 2026

   • Change header for EXISTS to remove backticks

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   • Update 15 - Exists.md

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2. Commits on Aug 30, 2026

   • Update Sample Data.md

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   • Update 04 - Equi, Theta, and Natural Joins.md

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   • Update 16 - Complex Joins.md

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   • Update 15 - Exists.md

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   • Update 14 - Join Algorithms.md

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   • Update 13 - Set Operations.md

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   • Update 12 - Relational Division.md

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   • Update 11 - Self Join.md

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   • Update 09 - Semi and Anti Joins.md

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   • Update 08 - Cross Join.md

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   • Update 07 - Full Outer Join.md

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   • Update 06 - Outer Joins.md

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3. Commits on Aug 29, 2026

   • Update 05 - Inner Join.md

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   • Update 04 - Equi, Theta, and Natural Joins.md

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   • Renumber examples from 9-13 to 10-14

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   • Update 05 - Inner Join.md

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   • Update Behavior_of_Nulls.md

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   • Update Behavior_of_Nulls.md

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4. Commits on Aug 28, 2026

   • Update Behavior_of_Nulls.md

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   • Update SQL examples for NULL behavior clarity

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   • Format SQL examples and emphasize NULL handling

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   • Update ISNULL and COALESCE explanations

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   • Update Behavior_of_Nulls.md

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   • Update Behavior_of_Nulls.md

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   • Update Behavior_of_Nulls.md

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5. Commits on Aug 27, 2026

   • Update Behavior_of_Nulls.md

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   • Update Behavior_of_Nulls.md

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6. Commits on Aug 26, 2026

   • Update print statement from 'Hello' to 'Goodbye'

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   • Update Advanced SQL Puzzles Solutions.sql

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   • Update Advanced SQL Puzzles DDL.sql

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   • Add navigation link and section header for Part II

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   • Update Advanced SQL Puzzles Markdown.md

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   • Update Behavior_of_Nulls.md

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