Re: [firebird-support] double precision remove last 2 numbers
On 2020-02-26 19:41, hamacker sirhamac...@gmail.com [firebird-support] wrote: > When I started my test, I turn off my app. > > And do update(and select) using only ISQL tool (IBExpert) and > dbweaver. > in both I had to configure select to show float using mask > (0.##..), so the number can be different that I show you, but > always eat last numbers.I need to store long decimals numbers maybe > more than 15 decimals, is it possible without store as string? Firebird 3 supports a maximum precision of 18 using the fixed point types `NUMERIC(18,x)` and `DECIMAL(18,x)`, however then you most now the number decimals at declaration time. If you need floating-point-like behaviour, you need to wait for Firebird 4, where you can use datatype DECFLOAT (precision of 34), or maybe the extended precision DECIMAL/NUMERIC with a maximum precision of 38. Storing as string is an option, but that will make it very hard to do any calculation with them, and might force you to cast to `double precision` to perform that calculation, which throws any benefit of the stored precision out of the door. Mark
Re: [firebird-support] double precision remove last 2 numbers
Maybe between 8 and 15 decimals, not more. Em qua., 26 de fev. de 2020 às 16:10, Dimitry Sibiryakov s...@ibphoenix.com [firebird-support] escreveu: > 26.02.2020 19:41, hamacker sirhamac...@gmail.com [firebird-support] wrote: > > I need to store long decimals numbers maybe more than 15 decimals, is it > possible without > > store as string? > >If your task requires such number you should consider using of Firebird > 4 or Oracle. > > > -- >WBR, SD. > > > > > > > ++ > > Visit http://www.firebirdsql.org and click the Documentation item > on the main (top) menu. Try FAQ and other links from the left-side menu > there. > > Also search the knowledgebases at > http://www.ibphoenix.com/resources/documents/ > > ++ > > > Yahoo Groups Links > > > >
Re: [firebird-support] double precision remove last 2 numbers
26.02.2020 19:41, hamacker sirhamac...@gmail.com [firebird-support] wrote: > I need to store long decimals numbers maybe more than 15 decimals, is it > possible without > store as string? If your task requires such number you should consider using of Firebird 4 or Oracle. -- WBR, SD. ++ Visit http://www.firebirdsql.org and click the Documentation item on the main (top) menu. Try FAQ and other links from the left-side menu there. Also search the knowledgebases at http://www.ibphoenix.com/resources/documents/ ++ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/firebird-support/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/firebird-support/join (Yahoo! ID required) <*> To change settings via email: firebird-support-dig...@yahoogroups.com firebird-support-fullfeatu...@yahoogroups.com <*> To unsubscribe from this group, send an email to: firebird-support-unsubscr...@yahoogroups.com <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/
Re: [firebird-support] double precision remove last 2 numbers
When I started my test, I turn off my app. And do update(and select) using only ISQL tool (IBExpert) and dbweaver. in both I had to configure select to show float using mask (0.##..), so the number can be different that I show you, but always eat last numbers. I need to store long decimals numbers maybe more than 15 decimals, is it possible without store as string? Em qua., 26 de fev. de 2020 às 15:21, Mark Rotteveel m...@lawinegevaar..nl [firebird-support] escreveu: > > > 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$database`), I get a value of > 42.50306433697285, which suggest that your software may do some > additional rounding or truncation when presenting the value. > > Mark > >
Re: [firebird-support] double precision remove last 2 numbers
On 2020-02-26 19:07, hamacker sirhamac...@gmail.com [firebird-support] wrote: > Hi All, > > I do this update: > UPDATE CV SET > perc_lucro=42.503064336972848 > WHERE (id_cv=57528) > > Then I do a select and 'perc_lucro' was change to 42,5030643369728 > after updated, two last numbers disappear. > Why? > perc_lucro is double precision type. > FB 3.0.5 32bits, Windows 64. A double precision is not an exact numeric type, it has roughly a precision of 15-17 decimals. Even that isn't entirely correct because of how a double precision works. In any case, a double precision cannot exactly store 42.503064336972848. However, when testing this (with `select cast(42.503064336972848 as double precision) from rdb$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
[firebird-support] double precision remove last 2 numbers
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.
