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Hands-on clinic: SQL joins, keys, and indexing decisions

From ER diagrams to EXPLAIN, with schemas students can bring from class projects.

Topics on the table

  • Primary keys, foreign keys, and why orphan rows appear
  • INNER versus LEFT joins with a small sample schema
  • When an index helps — and when it only slows writes

Bring a draft schema from a campus project. Review the Database Fundamentals Quiz explanations afterward to lock the vocabulary.

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