Mastering SQL: Window Functions, Joins, CTEs and Subqueries
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Introduction Basic SELECT, WHERE and GROUP BY statements answer simple questions: how many visits happened, or how much money a department earned. Real hospital analytics asks harder ones. Which doctor’s most expensive visit was it? How long was it between a patient’s first and second visit? Which…
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- 2026-10-19 18:11 · DEV Community — AI
Mastering SQL: Window Functions, Joins, CTEs and Subqueries