OTBI - Not exists / Outer Join ?

Summary

Can we write a report where something DOESNT exist?

Content

I want to create a report where we list where a user HASNT entered their timecard records.

So effectively I'm looking for either an outer join, or to say "give me all the people records where NOT EXISTS Select timecards from last week etc"

In SQL I could easily use NOT IN, or an outer join etc - is this doable in OTBI ??