SQL window functions: how OVER() workspic.twitter.com/zQhPqtTzQy
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SQL window functions: how OVER() workspic.twitter.com/zQhPqtTzQy
The best way I know to explain this is: window functions don't change the number of rows. With GROUP BY, each group of input rows is used to compute one (new) output row, with the input discarded. Window funcs keep all the input, just make extra rows available for computation
Yet, in Example 2 there are a different number of rows..??..
These examples aren't showing the actual query result.
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