Question

I have a table like this –

cdr_pkey as serial, calldate as timestamp, src as text, duration as bigint

I need to find top 10 most frequent numbers in ‘src’ column, together with the number of occurrence in the table by using SQL query.

I tried by exporting to Excel and run Mode function but the records are around 7 million so it is not so efficient.

PS. I’m using PostreSQL 9.1

Answer 1

select 
    src as text,
    count(*) as total
from t
group by 1
order by total desc
limit 10;