Spark SQL - Windowing Functions - Windowing Functions
Let us see details about windowing functions within each group
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* We have functions such as lead, lag, first, last etc
* We need to create spec for most of the ranking functions by
specifying grouping column under PARTITION BY clause and then
sorting column under ORDER BY clause.
* lead and lag take the column names or expressions using which
we need to get required information.
* Some realistic use cases
* The salary difference between current and next/previous
employee within each department
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