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Commits on Jun 15, 2026

• Add files via upload

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Commits on Jun 12, 2026

• Update 04_database_dependencies_analysis.md

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• Update grouping ID explanation in SQL puzzles

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Commits on Jun 11, 2026

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Commits on Apr 23, 2026

• Fix SQL syntax in Behavior_of_Nulls.md

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Commits on Apr 17, 2026

• Update 09 - Semi and Anti Joins.md

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Commits on Mar 24, 2026

• Refactor truth tables section for clarity

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• Add truth table for conditional statements

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• Update Truth_Tables.md

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Commits on Mar 23, 2026

• Revise Truth Tables article for clarity and readability

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• Add 'Truth Tables' to the readme

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Commits on Jan 23, 2026

• Refactor SQL script for dropping and creating objects

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• Refactor SQL script for dropping and creating objects

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• Fix typo in 'Comparison Operators' section

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• Update recursion SQL example with new metadata

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

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

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• Update Advanced SQL Puzzles DDL.sql

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• Update Advanced SQL Puzzles DDL.sql

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Commits on Jan 9, 2026

• Update Truth_Tables.md

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Commits on Dec 25, 2025

• Update readme.md

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• Update readme.md

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• Update readme.md

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• Fix formatting and update error messages in Behavior_of_Nulls.md

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• Modify CHECK constraint and clarify SQL behavior

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• Change NULL representation in Behavior_of_Nulls.md

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• Fix NULL representation in Behavior_of_Nulls.md

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• Update Behavior_of_Nulls.md

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• Rename README.MD to Database_Certifications.md

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• Delete Database Articles/Database Dependencies/README.MD

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• Add Truth_Tables.md to Truth Tables directory

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