window-functions Archives

Programming, sql

IT Nursery

What’s the difference between RANK() and DENSE_RANK() functions in oracle?

What’s the difference between RANK() and DENSE_RANK() functions? How to find out nth salary in the following emptbl table? DEPTNO EMPNAME SAL ------------------------------ ...

May 30, 2022
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Programming, Python

IT Nursery

Pandas get topmost n records within each group

Suppose I have pandas DataFrame like this: df = pd.DataFrame({'id':[1,1,1,2,2,2,2,3,4],'value':...

May 26, 2022
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Oracle “Partition By” Keyword

Can someone please explain what the partition by keyword does and give a simple example of it in action, as well as why ...

May 18, 2022
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SQL Server: Difference between PARTITION BY and GROUP BY

I’ve been using GROUP BY for all types of aggregate queries over the years. Recently, I’ve been reverse-engineering some code that uses PARTITION ...

May 6, 2022
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