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SQL join - one to many

juliemcnichols
on
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Last Modified: 2012-05-11
I have two tables.  A simplified listing of the fields is shown below:

      CallTable            HistoryTable
                  
      firstname            identity
      lastname            calldate
      phone            disposition
      identity            

One record in the call table per customer (key=identity)
Multiple records in history table for the same identity.

I want to pull a list of call failures (any identity that did not have a record in the history table with disposition='success') and the last time the call was attempted.  This is my first attempt at building the query. (I obviously am not a SQL guru)

SELECT c.FirstName, c.LastName, MAX(h.calldate) , h.Disposition, h.identity
FROM  calltable AS c INNER JOIN
               HistoryTable AS h ON c.IDENTITY = h.identity
WHERE (c.IDENTITY NOT IN
                   (SELECT DISTINCT identity
                    FROM   HistoryTable
                    WHERE (disposition = 'success')))
GROUP BY c.FirstName, c.LastName, h.disposition, h.identity

This is not working properly and i'm guessing it has to do with the fact that this is a one to many relationship.  How can this query be restructured so it works properly?
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