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Implementing Multilevel ranking in T-SQL

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Submitted on: 2/20/2002 12:09:55 AM
By: Harinatha Reddy Gorla 
Level: Intermediate
User Rating: By 4 Users
Compatibility:SQL Server 7.0

Users have accessed this article 1912 times.
 

(About the author)
 
     These are one of the tricky methods where we have adopt different logic. This snippet will give you an idea how to implement multilevel ranking

 
 
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Let's think we are having a table with different PEOs for each FirmID.
Table name : tblRanking 
FID PEO
----------- -----------
120000331
120000630
120000930
120001231
220000331
220000630
220000930
220001231
To give ranking for PEOs for each CompanyId, add one column, say "Rank" to 
the present table and use the following script.
//-------------------
ALTER TABLE tblRanking ADD Rank int NULL
drop table #fid
declare @Start int
declare @FID int
select @Start = 0
select distinct fid into #fid from tblRanking
update t1 set @Start = Rank = case
when t1.fid = @FID then @Start + 1 else 1 end,@fid = t2.FID 
from tblRanking t1 ,#fid t2 where t1.fid = t2.fid
select * from tblRanking
//-------------------
FID PEO RANK
----------- ----------- ----------- 
1200003311
1200006302
1200009303
1200012314
2200003311
2200006302
2200009303
2200012314


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