On 10 Jul 2009, at 9:31pm, Rick Ratchford wrote:

> After examining the above, it appears that what this does is modify  
> the
> table itself. So I suppose then that it is not possible to create a
> recordset instead that meets what I'm trying to do. If this is the  
> case,
> I'll have to make a copy of this table first as I don't want to  
> modify the
> original.


I don't understand why people keep trying to do these things inside  
SQL when they're obviously ysing a programming language anyway.  If  
the solution was entirely without a programming language there would  
be some point to it, but since you have your programming language, why  
not take advantage of it ?  Keeping the previous value of a field in a  
variable does not take lots of programming !

Read the existing records from taxTable in date order.  Compare the  
value of 'tax' in this record with the one you remember from the  
previous record.  No need to write a new table.  No need to write the  
directions to disk at all, since you apparently only need them for  
output.

Simon.
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