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09.30.2008 at 05:28PM PDT, ID: 23776620
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9.4

Finding records in one column in the same table that are referring to missing records in another column

Asked by haselwood in SQL Query Syntax, Microsoft Access Database

Tags: , , ,

Please see attached spreadsheet.

I have two columns of data and need to creat a query to find missing records.

Document_ID and Host_Reference

Where Host_Reference IS NOT NULL, the corresponding Document_ID is denoted as an Attachment and the record listed in Host_reference is denoted as the HOST.

Where Host_Reference IS NULL, Document_ID is denoted as a Single.

I am having the problem in this dataset of identifying ALL Attachments in Document_ID that refer to HOSTS that don't exist.

ie: There is a host_reference entry, however it does not exist in Document_ID
Document_ID           Host_Reference
ABC.002.005.0094      
ABC.002.005.0116      ABC.002.005.0112
ABC.002.005.0118      

From the above example - ABC.002.005.0116 is an attachment to ABC.002.005.0112 - however ABC.002.005.0112 does not exist.

Thanks

DougStart Free Trial
Attachments:
 
MISSING-HOSTS.xls (297 KB) (File Type Details) 
Missing Hosts
 
[+][-]09.30.2008 at 05:47PM PDT, ID: 22610739

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About this solution

Zones: SQL Query Syntax, Microsoft Access Database
Tags: Microsoft, Access, 2003, Query
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Solution Provided By: mwvisa1
Participating Experts: 3
Solution Grade: A
 
 
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