Hasty Briefsbeta

SQL Design Patterns

14 days ago
https://vadimtropashko.wordpress.com/%e2%80%9csql-design-patterns%e2%80%9d-book/about/
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  • #SQL
  • #Relational Algebra
  • #Database Queries
  • Relational Division is frequently used for 'shopping basket' pattern reports in sales data.
  • SQL's UNION CORRESPONDING is similar to RL's inner union, historically available in ISBL/BS12 as plain UNION.
  • UNION CORRESPONDING is noted as the inverse of Natural Join, a realization not widely acknowledged.
  • A discrepancy in SQL queries was noted where a scalar subquery returned zero, differing from the predecessor query's results.
  • Feedback on a book includes appreciation and a minor correction regarding a chapter link typo.
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