How to achieve the count(distinct ) function in SQL
chenzhaohangbj12 opened this issue · comments
I would like to use the "count(distinct )" query, but not found in the wiki,Slq4d Whether or not support this function？
thank you~
See posts in this blog http://druidwithsql.tumblr.com/ . Search for UNIQUE
Why the result is “11.029647221949576”
Maybe “11” is what I want.
Thats because of approximation algorithm druid uses. You can trim it to integral value on client side.
thank you!