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Microsoft Access 1000 backward compatibility for SQL expressions

Posted on 2002-03-07
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Last Modified: 2008-03-06
Hi!

I have an Access 97 database with several queries that don't run on Access 2000. An example query is:

SELECT Features.*, Subsystems.SubsystemName, SiteSubsystems.[Instance Number]
FROM (Features LEFT JOIN Subsystems ON Features.PrimarySubsystemID=Subsystems.SubsystemID) LEFT JOIN SiteSubsystems ON Features.PrimarySubsystemID=SiteSubsystems.SubsystemID
 AND SiteSubsystems.[Sequential Index]=1
ORDER BY FeatureName;

When running it on Access 2000 I get the following error:

Microsoft Access can't represent the join expression
Features.PrimarySubsystemID=SiteSubsystems.SubsystemID
AND SiteSubsystems.[Sequential Index]=1

The query result is as if the join expressin is entirely
ignores the join expression. Needless to say it works fine on Access 97.

I run this query in my VB application via ADO 2.5 and the MDB is of version 97. There I don't get any error message, however the query result is wrong like I described.

Any ideas ?
What components does ADO use for Jet databases ? Maybe I need to replace this component with an older version ?

please help
thanks,
Dani
What component does ADO use
 
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Question by:logindani
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11 Comments
 
LVL 9

Expert Comment

by:ornicar
ID: 6847374
My experience on converting queries to A2000 is that sometimes they have to be kind of 'refreshed'. Try to copy the SQL into a new query. It might work. I had several queries that needed to do so.
Also make sure the tables Features ans SiteSubsystems exists and are reachable.
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LVL 8

Expert Comment

by:dovholuk
ID: 6847560
maybe toss some parentheses around the left join? such as:

SELECT Features.*, Subsystems.SubsystemName, SiteSubsystems.[Instance Number]
FROM (Features LEFT JOIN Subsystems ON Features.PrimarySubsystemID=Subsystems.SubsystemID) LEFT JOIN
SiteSubsystems ON ( Features.PrimarySubsystemID=SiteSubsystems.SubsystemID
AND SiteSubsystems.[Sequential Index]=1 )
ORDER BY FeatureName;

it seems that access 2000 syntax isn't quite the same as 97. i ran into this issue when dealing with ANSI sql statements and the effective "order" of parentheses. it was a real pain.

what you could do, along the lines that ornicar has mentioned, is simply rebuild the query. it doesn't look horribly difficult to redo, but it's a real pain i'm sure to have to redo all your queries.

good luck

dovholuk
0
 
LVL 9

Expert Comment

by:ornicar
ID: 6847817
Well, I didn't mean rebuild them from scratch: Just copy the SQL from the old query and paste it in a new query does the trick. Strange, but this is what I experienced.
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LVL 12

Expert Comment

by:Paurths
ID: 6849684
ornicar,
nothing strange about that

afterall, it is a microsoft product... :-)

cheers
Ricky
0
 
LVL 9

Expert Comment

by:ornicar
ID: 6854810
a Microstrange product... :-)
Man, this means you have to test all your queries :-(
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Author Comment

by:logindani
ID: 6856054
It was a syntax problem in the query:
SiteSubsystems ON ( Features.PrimarySubsystemID=SiteSubsystems.SubsystemID
AND SiteSubsystems.[Sequential Index]=1 )
ORDER BY FeatureName;

should have been:
Features.PrimarySubsystemID=SiteSubsystems.SubsystemID
WHERE SiteSubsystems.[Sequential Index]=1 )
ORDER BY FeatureName;

for some reason on 97 it worked fine !!!?!!
0
 

Author Comment

by:logindani
ID: 6856056
It was a syntax problem in the query:
SiteSubsystems ON ( Features.PrimarySubsystemID=SiteSubsystems.SubsystemID
AND SiteSubsystems.[Sequential Index]=1 )
ORDER BY FeatureName;

should have been:
Features.PrimarySubsystemID=SiteSubsystems.SubsystemID
WHERE SiteSubsystems.[Sequential Index]=1 )
ORDER BY FeatureName;

for some reason on 97 it worked fine !!!?!!
0
 
LVL 9

Expert Comment

by:ornicar
ID: 6856539
Be careful and compare the two queries in design view: In the original one, you have LEFT JOIN, and you don't have with the new syntax.
This means that in certain occasions, the two queries don't give the same result!
To set an outer join, double-click the relation line between the two tables and choose option 2 or 3. See the small arrow?
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Expert Comment

by:Moondancer
ID: 7018988
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Expert Comment

by:nico5038
ID: 7049022
for logindani

No comment has been added for the last two months.
So it's time to clean up this TA.
I will leave a recommendation in Community Support that this question is:
 - PAQ'd and pts removed
Please leave any comments here within the
next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER !

Nic;o)
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