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Error on nulls with Left Mid() function

Posted on 2011-03-12
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Last Modified: 2012-05-11
this function in Access produces an error on nulls in the column:
Left(Right(,Len()-InStr(),"(")),Len(Right(,Len()-InStr((),"(")))-1) - how can this be rewritten so that it will convert nulls into empty strings?  

Also, will this work in SQL 2005?  thanx
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Question by:bar0822
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7 Comments
 
LVL 8

Accepted Solution

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Andrew_Webster earned 250 total points
ID: 35116239
Use Nz(MyColumn,"").

Nz will work in an Access query of linked SQL Server data.  It will not work in a pass-through query that is evaluated by SQL Server as it's a VBA method, not a SQL method.

In T-SQL you can use ISNULL(MyColumn,"") instead.
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LVL 75
ID: 35117341
I hate to say this, but your expression has many issues.  For starters, your InStr() functions have no arguments ... which is your first issue.  Next, Your Right() function syntax is incorrect.  

Left(Right(,Len()-InStr(),"(")),Len(Right(,Len()-InStr((),"(")))-1)


Left(Right(,Len()-InStr(),"(")),Len(Right(,Len()-InStr((),"(")))-1)

Please look these up in VBA Help to get the correct syntax ...

mx
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LVL 75
ID: 35326011
"bar0822 declined to include the actual strings and/or fields used in the expression and in doing so"
I see. Just to make it a trick question.
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LVL 75
ID: 35326029
@JDettman:
"Nice to see you wanting to go the extra mile here,"
Huh?  Not related.
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LVL 8

Expert Comment

by:Andrew_Webster
ID: 35328105
I agree with everyone!  Yes, the expression is a mess, and a royal pain to debug.  But the question was about how to convert Nulls to empty strings, and that was the answer given.

If I was stuck with that expression, I'd probably write a VBA function to clean it up, and call that from a query.  But even that might depend on the performance, as if it's in a query that hits many rows then performance could be a dog.

But I'm not going to go into "what ifs" or I'd drive myself nuts.  More nuts.
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