Perform arithmetic in SQL -


could please me this? have following query returns country name, number of records each country, , total number of countries . how can return column % of each country respect total number. ideal output like.

usa, 25, 100, 25% ... uk, 28, 100, 28% ... etc...

select country, count(country) number, (select count(country)  from[customers]) total [customers]  group country order number desc

i have tried number/total percent didn't work. doing wrong.

i want able filter countries above percentage 20%.

thanks!

use derived table, subquery alias.

select number/total percent  ( query goes here ) derivedtable

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