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Left join in query
John W. Vinson wrote:
On Thu, 20 May 2010 11:42:01 -0700, Tara wrote: FROM QryAmendedContacts, tblDates WHERE (((QryAmendedContacts.PostedDate) Between [tblDates]![StartDate] And [tblDates]![EndDate])); As Daryl and Marshall said, you're using a criterion on the query field PostedDate. For those records where no query record exists, that field will be NULL - and NULL is in fact *not* Between those two dates. Try changing the WHERE clause to WHERE QryAmendedContacts.PostedDate Between [tblDates]![StartDate] And [tblDates]![EndDate] OR QryAmendedContacts.PosteDate IS NULL Repro: tblContact: ContactID PostedDate 1 5/1/2010 2 5/10/2010 3 5/16/2010 4 5/17/2010 5 5/20/2010 6 5/19/2010 tblAmendedDates: ContactID AmendedDate AmendmentText 1 5/7/2010 ttt 1 5/8/2010 t2 3 5/20/2010 t1 3 5/21/2010 t2 6 5/20/2010 t1 QryAmendedContacts, SELECT tblContact.ContactID, tblContact.PostedDate, tblAmendedDates.AmendedDate, tblAmendedDates.AmendmentText FROM tblContact LEFT JOIN tblAmendedDates ON tblContact.ContactID = tblAmendedDates.ContactID; returns: ContactID PostedDate AmendedDate AmendmentText 1 5/1/2010 5/7/2010 ttt 1 5/1/2010 5/8/2010 t2 2 5/10/2010 3 5/16/2010 5/20/2010 t1 3 5/16/2010 5/21/2010 t2 4 5/17/2010 5 5/20/2010 6 5/19/2010 5/20/2010 t1 and this query SELECT QryAmendedContacts.ContactID, QryAmendedContacts.PostedDate, QryAmendedContacts.AmendedDate, QryAmendedContacts.AmendmentText FROM QryAmendedContacts WHERE (((QryAmendedContacts.PostedDate) Between #5/15/2010# And #5/20/2010#)); returns the expected result: ContactID PostedDate AmendedDate AmendmentText 3 5/16/2010 5/20/2010 t1 3 5/16/2010 5/21/2010 t2 4 5/17/2010 5 5/20/2010 6 5/19/2010 5/20/2010 t1 What am I missing? -- Bob Barrows |
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