Well I do. But when I use sqlite in PHP I have default round.
Radovan
On 24.05.2019 13:39, Alessandro Merolli wrote:
Great! Now use SQLite API and add a new user defined function for your used
case.
I suppose that SQlite should always follow a well-defined pattern: in this case
as Mr. Hipp said, it is IEEE754.
Cheers!
On 24 May 2019, at 08:27, radovan5 <radovan.antl...@siol.net> wrote:
In Delphi I have 2 functions that works (I override default sqlite round):
const
ExtEps = 1.0842021725E-19;
DblEps = 2.2204460493E-16;
KnownErrorLimit = 1.234375;
SafetyFactor = 2;
MaxRelErrDbl = DblEps * KnownErrorLimit * SafetyFactor;
MaxRelErrExt = ExtEps * KnownErrorLimit * SafetyFactor;
function RoundExt(const AValue: Extended; const ADigit: Integer = -2): Extended;
var
E: Extended;
begin
E := IntPower(10, -ADigit);
Result := Round(AValue * (1 + MaxRelErrExt) * E) / E;
end;
function RoundDbl(const AValue: Double; const ADigit: Integer = -2): Double;
var
E: Double;
begin
E := IntPower(10, -ADigit);
Result := Round(AValue * (1 + MaxRelErrDbl) * E) / E;
end;
You could implement it in sqlite.
Regards Radovan
On 24.05.2019 13:13, Richard Hipp wrote:
On 5/24/19, Hajo Bruns <hbr...@plansoft.de> wrote:
Hi,
the round function seems to round inconsistently:
ivesselect round(5.485,2), round (3.555,2),round (3.255,2)
gives
5,49 3,56 3,25
Last result should be 3.26
3.255 cannot be exactly represented as an IEEE754 double-precision
binary floating point number. So the system has to use an
approximation. The closest approximation is
3.25499999999999989341858963598497211933135986328125 and that value
rounds to 3.25.
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