[AccessD] Missing Issues Query

Seems like if they're in consecutive order, you could use an expression to
compare... 

Gustav, if you see this, didn't we write about this? We used a form to find
missing values -- might be exactly what Bryan needs. If I can find it, I'll
send the article and example database to you Bryan. 

Also, I know I've done this in reports -- finding holes in sequential
numbers. 

Susan H. 

Hi Bryan,
If I understand your problem correctly, you have entries only for those
issues you possess - there are no blank issue entries.  So, you will be
looking for a skip in the issue numbers or in the dates.  Aside from writing
something that meanders through all the dates or some combination of
volume-issue-date to see where the pattern breaks, would it work for you to
use a temporary date table with the dates that SHOULD all be there and use
that table with your issues table and do the outer join trick against it?
That would give you the dates that are missing and you could fill in the
appropriate volume and issue numbers by inspection.  Hope that helps a
little.
Tina

Bryan Carbonnell wrote:
> On 8/17/07, Gary Kjos <garykjos at gmail.com> wrote:
>   
>> Well what you are after is a left join kind of a query from the table 
>> that has all the magazines go the table that has the missing ones 
>> with the join option to say "give me all the records" in the table 
>> with all the magazines. Then you do a condition on one of the table 
>> fields in the other table to test for "IS Null" and you will only get 
>> the ones that are missing.
>>     
>
> Maybe I'm missing what you are saying Gary, but I've only got 1 table, 
> and that is the table with the issues of the magazine that I have. I 
> don't have table with a full list of potential issues.
>
>   
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