Ranking system gaps in ranking output

Question

I have this project that it ranks different items by their scores, the ranking is okay but it shows gaps when there is a tied score.

Here is the query:

S         


        

Answer 1

You basically need Dense_Rank() like functionality (available in MySQL version >= 8.0). In older versions of MySQL, it can be emulated using Session Variables.

• In a Derived table, determine ranking of a scc_bgyscoretotal (highest value having rank 1 and so on). Firstly, get unique values of scc_bgyscoretotal, and then determine their ranking using Session Variables.
• Now, simply join these Derived table to the main table bgyprofile using scc_bgyscoretotal.

Try the following:

SELECT t2.bgycode, 
       t2.scc_bgyscoretotal, 
       dt2.`rank` 
FROM bgyprofile AS t2 
JOIN 
(
 SELECT dt1.scc_bgyscoretotal, 
        @rank_no := @rank_no + 1 AS `rank`  
 FROM 
 (
  SELECT t1.scc_bgyscoretotal 
  FROM bgyprofile AS t1 
  GROUP BY t1.scc_bgyscoretotal 
  ORDER BY t1.scc_bgyscoretotal DESC
 ) AS dt1 
 CROSS JOIN (SELECT @rank_no := 0) AS init1
) AS dt2 ON dt2.scc_bgyscoretotal = t2.scc_bgyscoretotal