How do I search for data that's not there?

Question

Scenario:
The store managers are supposed to upload the previous days data by 11am the following day.
I have a table of stores (74 records, 1 for each store) and a table of events (3600+ records,1 for each store per day). When I look at the event data selecting a specific date, I can see I only have 71 records, but I can't easily tell which stores are missing.  I want to gather all the events for a date, then look for the store records and report only if the store is NOT there.  I have tried the following linking options:
store.store_no (equal to link) event.store_no (gives all 71 event records, as expected, but not the ones that aren't there)
store.store_no (not equal to link) event.store_no (gives all 71 event records, for each store record, store1, event 1, store1, event2, store2, event1, stove2, event2, etc) I believe this is because it's looking for the store match first, not the date, then the store)
store.store_no (left outer join) event.store_no (gives all 71 event records, as expected, but not the ones that aren't there at the bottom, like the help states)
I thought of subreport too, but you can't like on what's not there.
does anybody have any clues?
BTW, I'm using 8.5 but can change to 10.
Thanks,
Clare

Answer 1

Carl,
Thanks so much. I took we a while to get the formatting correct, here's what I ended up with:
SELECT
    store."store_number", store."address1"
FROM
    "sac"."store" LEFT OUTER JOIN (SELECT * from "sac"."posj_event"  WHERE  posj_event."business_date" = {d '2009-07-08'} ) ev  ON store."store_number"=ev."store"   
WHERE
    ev."store" is null
ORDER BY
    store."store_number" ASC
My original report was set to look for CurrentDate-1, which translated to {d '2009-07-08'} will that still work here?
Clare