MySQL 5.6 - DENSE_RANK like functionality without Order By

Question

I have a table like this:

+------+-----------+
|caseID|groupVarian|
+------+-----------+
|1     |A,B,C,D,E  |
+------+-----------+
|2     |A,B,N,O,P  |
+----         


        

Answer 1

You could use DENSE_RANK(MySQL 8.0):

SELECT *, CONCAT('v', DENSE_RANK() OVER(ORDER BY groupVarian)) AS namevarian
FROM tab
ORDER BY CaseID;

db<>fiddle demo