Question

I want to find number of repeated value in group using single select query.
I can’t use the column in group by for which I want to find number of occurrence in some group.

e.g.

obsid    Name      Value                 
1        Ronak     120
2        Ronak     125   
3        Ronak     120                      
4        Pankti    130                      
5        Pankti    130
6        Sanket    140     
7        Aakash    140
8        Unnat     120

Now I want to develop select query in mysql that give me below result

obsid    Name      Value     Value_occurrence             
1        Ronak     120       2
2        Ronak     125       1              
4        Pankti    130       2              
6        Sanket    140       1
7        Aakash    140       1
8        Unnat     120       1

Answer 1

Group by the desired columns and use COUNT to count the rows in each group:

SELECT MIN(`obsid`) AS `obsid`, `Name`, `Value`, COUNT(*) AS Value_occurrence             
FROM yourtable
GROUP BY `Name`, `Value`

Try this online demo which shows your example data and the results for the above query.