David
I completely agree. For now, I'm afraid you'll have to use decimal or some
other datatype. You could file a bug on the server as this is definitely
something we can fix.
>
> Reggie,
>
> > Have a look at this link (if you have not already).
> >
> > http://dev.mysql.com/doc/refman/5.1/en/problems-with-float.html
>
> Thanks. I've seen it before..
>
> I don't think it's relevant (but feel free to correct me):
>
> a) In the case we're discussing, the user does not have control over
> the query. It's built for him. (... And the query builder has no
> provision for setting a precision to use when comparing floats. It
> could in theory do as the example you link to, but it doesn't..)
>
> b) MySQL stores floating point numbers in one precision. It compares
> numbers using this precision. But it returns results with another
> (lower) precision.
>
> This issue would not need a workaround in each SELECT, if it was
> solved in the server so that numbers were either returned with a
> higher precision (enough to match the record later with a SELECT),
> or numbers were stored with a lower precision (in practice we'd be
> rounding numbers on INSERT rather than on SELECT).
>
> Solving the problem in the server would be consistent with what
> other professional database server products do, as far as I can see:
>
> INSERT: 0.666666666666667 0.6666666666666666
> (MySQL) SELECT *: 0.666666666666667 0.666666666666667
> (MS SQL) SELECT *: 0.66666666666666696 0.66666666666666663
> (MySQL) WHERE: 1 record 0 records
> (MS SQL) WHERE: 1 record 1 record
>
> (For the WHERE clauses I used the values I got from the server in
> the corresponding SELECT (on the same server type). For data types
> on MS SQL, I used the conversion table from
> http://www.microsoft.com/technet/prodtechnol/sql/2000/deploy/mysql.mspx
> )
>
> Ho hum..
>
>
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