On 2020-02-26 19:07, hamacker sirhamac...@gmail.com [firebird-support] wrote: > Hi All, > > I do this update: > UPDATE CV SET > perc_lucro=42.503064336972848 > WHERE (id_cv=57528) > > Then I do a select and 'perc_lucro' was change to 42,5030643369728 > after updated, two last numbers disappear. > Why? > perc_lucro is double precision type. > FB 3.0.5 32bits, Windows 64.
A double precision is not an exact numeric type, it has roughly a precision of 15-17 decimals. Even that isn't entirely correct because of how a double precision works. In any case, a double precision cannot exactly store 42.503064336972848. However, when testing this (with `select cast(42.503064336972848 as double precision) from rdb$database`), I get a value of 42.50306433697285, which suggest that your software may do some additional rounding or truncation when presenting the value. Mark
