Posted by mcdonaghandy on 07/17/07 17:22

Hello,

I have been having a tough time writing the follow requirement for a
query.

On a table that the primary key is a tagId and an hourly timestamp, I
would like to find out for every hour which tags did not get entered
into the database. Essentially I am looking for patterns of entries
that are not making it into tableB.

Examples of the tables:
TableA TableB
TagID and TagName TagId Timestamp
PK PK1 PK2

approx 6000 rows approx 6000 rows per hour

I am thinking that I will need to do something like:

Select tableB1.time, count(*) from tableB1 group by tableB1.time
having tableB1.time >= XXXX and tableB1.time <= XXXX and tableB1.tagId
not in (select tagId from tableA where not exists (select
tableA.tagId, distinct.tableB2.time from tableB2)

I have been trying to create an effecient query handle this but have
not had any luck. Any assistance would be more then appreciated.

Thanks,
Andy

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