TSQL mode (as in mean, median,mode)

Question

I\'m trying to calculate the mode of a series of idsofInterest in a table, each with an accompanying valueOfInterest such:

idsOfInterest | valueOfInterest  
         


        

Answer 1

The mode is the most common value. You can get this with aggregation and row_number():

select idsOfInterest, valueOfInterest
from (select idsOfInterest, valueOfInterest, count(*) as cnt,
             row_number() over (partition by idsOfInterest order by count(*) desc) as seqnum
      from table t
      group by idsOfInterest, valueOfInterest
     ) t
where seqnum = 1;