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handling NULLs in a query string


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I have a data driven website connected to a FileMaker Pro 8.5 database.

In my webform, I have a few dropdowns and textboxes.

The problem is that there are lots of empty fields in the database, so no matter what the user is going to enter, the search is not returning any data. So with one NULL in the queryString, no data will be returned.

Does anybody know the syntax of how to handle NULLs in a queryString? I know in Oracle there's the NVL function: NVL(value,NULL) it returns "value" and SQL Server it's ISNULL(value,null), it returns "value".

I'm not sure what's FileMaker's syntax...I tried both and of course didn't work...

any help would be really really appreciated!!

thansk

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