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Understanding SQL Execution Order

When we write an SQL query, we usually read it from top to bottom. SELECT department , COUNT ( * ) FROM employees WHERE salary > 50000 GROUP BY department HAVING COUNT ( * ) > 5 ORDER BY department…

  • Database executes SQL differently than top-to-bottom reading
  • FROM clause locates specified table, e.g., employees table
  • WHERE filters rows based on conditions, e.g., salary > 50000

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