Take a look at Thread #532360 for VFP to SQl Server comparison and at http://www.microsoft.com/SQL/techinfo/deployment/70/oraclemigrate.asp for SQL Server To Oracle.

>Folks,
>
>I noticed an earlier thread in which Miles asked about using a well-known VFP function in SQL.
>
>I have a similar question. I would like to be coding SQL expressions that are certain to run on any platform (well, you know, as much as one can be certain of such things).
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>Is there an online resource, perhaps similar to the W3C, that publishes a standard for extended syntax elements such as string concatenation, type conversions, and other things? Does such a standard even exist?
>
>For instance, in VFP I might do something like
>
>

>SELECT TTOC(MyDateTime) as "CharDateTime", Column1 + Column2 as "TwoStringsTogether"....
>

>
>But I have been mixing VFP syntax into my SQL for so long that I do not know what I will be facing if I try to purify my code to be back-end independent. Can I still accomplish these things, or do I have to code up different versions because every back-end has a different command for ISNULL()?
>
>Any pointers much appreciated...