On 19 December 2012 11:56, Friedrich Röhrs <f.roehrs(a)mis.uni-saarland.de> wrote:
I don't understand why 1.6e-8 is absolutly
necessary for sorting and
comparison. PHP allows for the definition of custom sorting functions. If a
custom datatype is defined, a custom sorting/comparision function can be
defined too. Or am i missing some performance points?
I believe for performance reasons in many cases sorting needs to be
performed already by the database and supported by an index. -- gregor