Window

Proving for windowing function

Proving for windowing function
  1. What is the correct syntax for a windowing function?
  2. Why is windowing function used?
  3. How are window functions implemented?

What is the correct syntax for a windowing function?

Basic windowing syntax. The usual suspects: SUM, COUNT, and AVG. ROW_NUMBER() RANK() and DENSE_RANK()

Why is windowing function used?

Window functions increase the efficiency and reduce the complexity of queries that analyze partitions (windows) of a data set by providing an alternative to more complex SQL concepts, e.g. derived queries. Common use cases include: Ranking results within a specific window (e.g. per-group ranking)

How are window functions implemented?

Window functions create a new column based on calculations performed on a subset or “window” of the data. This window starts at the first row on a particular column and increases in size unless you constrain the size of the window. Here we can see it perform an aggregation of what is in side of the window.

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