Solved

"Data type mismatch in criteria expression", just by JOIN'ing to another table

Posted on 2013-05-14
5
575 Views
Last Modified: 2013-05-14
Hello, I have two tables, say "tblParents" and "tblChildren" (Access 2010). They both have primary keys that are AutoNumber fields (say "ParentKey" and "ChildKey"). tblChildren carries ParentKey field as a Number, Long Integer.

There is a Relationship defined that LEFT JOIN's tblParents!ParentKey to tblChildren!ParentKey, as One-To-Many, all 3 options checked for Ref Integrity, Cascading Updates & Deletes.

I can start with a query with just tblChildren, printing most of the fields, for all records. No problems. But when I add tblParents to the query, and the JOIN is automatically created from the Relationship, I get the "Data type mismatch in criteria expression" error message, even if I don't throw down any fields from tblParents.

I have checked for missing or bad values in the key fields in both tables, and checked for orphans in tblChildren. Everything seems ok.

Any ideas?
0
Comment
Question by:mlagrange
5 Comments
 
LVL 77

Expert Comment

by:peter57r
ID: 39164498
We need to see the sql of the problem query.
0
 
LVL 119

Accepted Solution

by:
Rey Obrero earned 250 total points
ID: 39164500
have you tried doing Compact and repair?
File > manage >compact and repair
0
 
LVL 61

Assisted Solution

by:mbizup
mbizup earned 250 total points
ID: 39164505
Did you post the exact syntax you have tried in your query?

You need to use periods, not exclamation marks:

..... LEFT JOIN ....  ON tblParents.ParentKey = tblChildren.ParentKey

If that is not the problem, then do you have any corrupted records in either table where the PK field might have been messed up?

Try Compact/Repairing your database.
0
 
LVL 61

Expert Comment

by:mbizup
ID: 39164568
Also, for kicks - try sorting tblChildren by ParentID.

Does that reveal any blanks/nulls in the ParentID field?  These may cause an error in your JOINs.
0
 

Author Comment

by:mlagrange
ID: 39165188
ok, I was filtering on a date field in tblChildren, which I was wrapping with DateValue() to get rid of the time component on some records, and that worked fine, until I JOIN'ed to tblParents, which had some parent records with no children, as it turns out...

"WHERE DateValue(tblChildren!ChildDate) <= #04/30/2013#  "

The filtering on the expression that assumed a value in the date field was what was causing the error message, when it hit the nulls.

I reversed the lay-out of the query, LEFT JOIN'ing  tblChildren to tblParents, and that side-steps the "childless" parent records.

Thank you for your responses
0

Featured Post

Backup Your Microsoft Windows Server®

Backup all your Microsoft Windows Server – on-premises, in remote locations, in private and hybrid clouds. Your entire Windows Server will be backed up in one easy step with patented, block-level disk imaging. We achieve RTOs (recovery time objectives) as low as 15 seconds.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In the previous article, Using a Critera Form to Filter Records (http://www.experts-exchange.com/A_6069.html), the form was basically a data container storing user input, which queries and other database objects could read. The form had to remain op…
Describes a method of obtaining an object variable to an already running instance of Microsoft Access so that it can be controlled via automation.
Familiarize people with the process of utilizing SQL Server views from within Microsoft Access. Microsoft Access is a very powerful client/server development tool. One of the SQL Server objects that you can interact with from within Microsoft Access…
Show developers how to use a criteria form to limit the data that appears on an Access report. It is a common requirement that users can specify the criteria for a report at runtime. The easiest way to accomplish this is using a criteria form that a…

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now