CODEWITHSUNDEEP
sqlsql-serverazure-sql-databaseazure-sql-server
ITNube
ITNube

Reputation: 31

Custom Rank Calculation by a percentage range

I have this requirement of calculating a custom rank. I need to calculate Annualized % Return for all the 6 companies. I get rank from their return %. Let's consider this as input data. Now I need to calculate Custom Ranking where if another company's return is within a percentage point of Company A, I need to assign all these companies same rank (as shown in the chart below). I have 6 companies which is going to be fixed.

So, in a nutshell my requirement is to find which companies are within a percentage point return of company A. Then convert their rank to a string and concatenate their rank; keep the rest of the ranks the same and assign it to a new variable.

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Attached Image is for illustration only.

Upvotes: 0

Views: 108

Answers (1)

Squirrel
Squirrel

Reputation: 24783

The trick is to find the dense_rank() based on the absolute value of Difference from A. For difference less than 1.0%, it is treat as 0.

-- Sample Table
declare @company table
(
    Company         char,
    AnnualReturns       decimal(5,1)
)

-- Sample Data
insert into @company 
values ('A', 5.5), ('B', 7.7), ('C', -1.3), ('D', 6.3), ('E', 5.4), ('F', 9.0)

-- The query
; with cte as
(
    select  *,
        [Difference from A] = AnnualReturns - 5.5,
        ActualRank          = row_number() over (order by AnnualReturns desc),
        dr                  = dense_rank() over (order by case when abs(AnnualReturns - 5.5) <= 1.0 
                                                               then 0 
                                                               else abs(AnnualReturns - 5.5) 
                                                               end)
    from    @company
) 
select  Company, AnnualReturns, [Difference from A], ActualRank,
        stuff(RequiredRank, 1, 1, '') as RequiredRank
from    cte c
        cross apply -- concatenate the rank
        (
            select  '/' + convert(varchar(10), ActualRank)
            from    cte x
            where   x.dr    = c.dr
            order by ActualRank
            for xml path('')
        ) rr (RequiredRank)
order by Company

Upvotes: 2

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