Question

I am trying to write a write and the logic I am looking for is basically. If any User IDs from Table 1 do not exist in Table 2 show those in the results. So I did:

SELECT
  UserColder.ContactName,
  UserColder.Phone,
  UserColder.Email,
  UserColder.Website,
  Country.Name,
  UserColderZIP.[ZIP Code],
  UserColderZIP.[State Abbreviation]
FROM
  dbo.UserColder
  LEFT OUTER JOIN dbo.CountryUser
    ON UserColder.ID = CountryUser.[User ID]
  INNER JOIN dbo.Country
    ON CountryUser.[Foreign ID] = Country.ID
  LEFT OUTER JOIN dbo.UserColderZIP
    ON UserColder.ID = UserColderZIP.UserColder
WHERE
  UserColder.ID NOT IN (CountryUser.[User ID])

It returns data without the Where But with the Where I am trying to get it to show all the results where the Id from UserColder don’t have any records in CountryUser. Right now it is returning no results and I know ID 2 doesn’t exist in there. Any idea what I am doing wrong?

Thanks!

Answer 1

Since you have a LEFT OUTER JOIN, to get records from UserColder that don’t exist in CountryUser, check for NULL. The joined rows which have no corresponding value will return NULL.

WHERE
  CountryUser.[User ID] IS NULL