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Advanced SQL Queries: Subqueries, Unions, and Window Functions

Window functions calculate values across a set of rows related to the current row without collapsing rows into groups.

  • ROW_NUMBER(): Assigns unique sequential numbers.
  • RANK(): Assigns ranks with gaps on ties.
  • DENSE_RANK(): Ranks without gaps.
  • NTILE(n): Divides rows into n groups.
  • LEAD() / LAG(): Accesses next/previous rows.

Aug 03, 2024
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