How do I use ROW_NUMBER()?

Question

I want to use the ROW_NUMBER() to get...

1. To get the max(ROW_NUMBER()) --> Or i guess this would also be the count of all rows

Answer 1

May not be related to the question here. But I found it could be useful when using ROW_NUMBER -

SELECT *,
ROW_NUMBER() OVER (ORDER BY (SELECT 100)) AS Any_ID 
FROM #Any_Table