Window frame
A window frame is the set of rows positioned relative to the current row over which a window function is evaluated.
Just Use Postgres!
A window frame is the ordered subset of rows within a window partition that contributes to a window-function calculation for a row.
- How it is used
- Calculates running totals by progressively including ordered rows within each partition.
- How deep it goes
- Explains partitions, ordering, frame contents, and resulting totals, but does not cover explicit frame-bound syntax.
- Examples
- Uses streaming-play records for song 2, ordered users, and cumulative totals of 144, 350, and 654 seconds.
- What you can do after
- Apply window-frame syntax to calculate ordered cumulative totals in SQL.
DuckDB in Action
A window frame is the set of rows positioned relative to the current row over which a window function is evaluated.
- How it is used
- Uses relative rows to compute moving aggregates and other per-row analyses over ordered partitions.
- How deep it goes
- Defines row and range boundaries and demonstrates a centered seven-day frame, stopping short of broader frame variations.
- Examples
- Demonstrates daily energy readings, system partitions, and a seven-day moving average using a range frame.
- What you can do after
- Apply it via SQL to calculate moving averages over row-based or range-based windows.
Related concepts
- window functionpart of · A window function is an SQL operation that computes a value over related rows while preserving each individual row in the result.
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