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

Need to create virtual table by using WITH table AS, which is mention in given Query.

By using this virtual table, you can perform CRUD operation w.r.t row_number.

QUERY:

WITH table AS
-
(SELECT row_number() OVER(ORDER BY UserId) rn, * FROM Users)
-
SELECT * FROM table WHERE UserName='Joe'
-

You can use INSERT, UPDATE or DELETE in last sentence by in spite of SELECT.