On Friday, August 19, 2011, Brandon Allbery <allber...@gmail.com> wrote: > On Fri, Aug 19, 2011 at 11:45, Erik Hesselink <hessel...@gmail.com> wrote: >> >> Note that PostgreSQL also doesn't work with decimals as precision: >> >> postgres=# select 1::decimal(4,2) * 1::decimal(4,2); >> ?column? >> ---------- >> 1.0000 >> (1 row) >> >> That should be 1.00 instead if you want the precision correctly represented. > > Er? Last I checked, that was exactly how precision worked over multiplication; otherwise you are incorrectly discarding precision present in the original values. Unless you're assuming the OP actually wants an incorrect flat precision model....
This is the way I was taught to do it in physics. See also http://en.m.wikipedia.org/wiki/Significance_arithmetic Erik > > -- > brandon s allbery allber...@gmail.com > wandering unix systems administrator (available) (412) 475-9364 <tel:%28412%29%20475-9364> vm/sms > >
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