Re: [SQL] sum(bool)?
Olaf Marc Zanger wrote: >hi there, > >i want to add up the "true" values of a comparison like > >sum(a>b) > >it just doesn't work like this > >any workaround? select count(*) where a > b; -- Oliver Elphick[EMAIL PROTECTED] Isle of Wight http://www.lfix.co.uk/oliver PGP: 1024R/32B8FAA1: 97 EA 1D 47 72 3F 28 47 6B 7E 39 CC 56 E4 C1 47 GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839 932A 614D 4C34 3E1D 0C1C "But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us." Romans 5:8
Re: Fwd: Re: [SQL] sum(bool)?
Thus spake J.Fernando Moyano > El Viernes 23 Febrero 2001 16:22, escribiste: > > i want to add up the "true" values of a comparison like > > > > sum(a>b) > > > > it just doesn't work like this > > > > any workaround? > > I did exactly the same thing two months ago > > I created this tiny function: > > CREATE FUNCTION bool2int(bool) RETURNS integer > AS 'select (case when $1=true then 1 else 0 end)' > LANGUAGE 'sql'; > > > You can do: sum(bool2int(a>b)) > > easy ??? ;-)) Almost as easy as "SELECT COUNT(*) FROM table WHERE a > b" -- D'Arcy J.M. Cain| Democracy is three wolves http://www.druid.net/darcy/| and a sheep voting on +1 416 425 1212 (DoD#0082)(eNTP) | what's for dinner.
Fwd: Re: [SQL] sum(bool)?
El Viernes 23 Febrero 2001 16:22, escribiste: > hi there, > > i want to add up the "true" values of a comparison like > > sum(a>b) > > it just doesn't work like this > > any workaround? > > it is postgresql 7.0 under linux > > thanks > > olaf I did exactly the same thing two months ago I created this tiny function: CREATE FUNCTION bool2int(bool) RETURNS integer AS 'select (case when $1=true then 1 else 0 end)' LANGUAGE 'sql'; You can do: sum(bool2int(a>b)) easy ??? ;-)) -- Fernando Moyano Frase del día: -- El medico me prohibio beber wiski, ahora lo congelo y me lo como! (*) SymeX ==> http://symex.lantik.com (*) WDBIL ==> http://wdbil.sourceforge.net (*) Informate sobre LINUX en http://www.linux.org
[SQL] sum(bool)?
hi there, i want to add up the "true" values of a comparison like sum(a>b) it just doesn't work like this any workaround? it is postgresql 7.0 under linux thanks olaf -- soli-con Engineering Zanger, Dipl.-Ing. (FH) Olaf Marc Zanger Lorrainestrasse 23, 3013 Bern / Switzerland fon:+41-31-332 9782, mob:+41-76-572 9782 mailto:[EMAIL PROTECTED], http://www.soli-con.com
Re: [SQL] sum(bool)?
Or how about just: SELECT count(*) FROM tablename WHERE a > b; -- Andrew J Perrin - Ph.D. Candidate, UC Berkeley, Dept. of Sociology Chapel Hill, North Carolina, USA - http://demog.berkeley.edu/~aperrin [EMAIL PROTECTED] - [EMAIL PROTECTED] On Fri, 23 Feb 2001, Daniel Wickstrom wrote: > > "Olaf" == Olaf Zanger <[EMAIL PROTECTED]> writes: > > Olaf> hi there i'd like to add up the "true" values of a > Olaf> comparison like > > Olaf> sum(a>b) > > Olaf> it just doesn't work like this > > Olaf> any workaround > > Try using a case statement: > > select sum(case when a > b then 1 else 0 end) > > > -Dan >
Re: [SQL] sum(bool)?
hi there, s cool, this works streight away and took 5 min. waiting for a answer :-) thanks very much to you tod personal and the mailing list for existence. Olaf Tod McQuillin schrieb: > > On Fri, 23 Feb 2001, Olaf Zanger wrote: > > > i'd like to add up the "true" values of a comparison like > > > > sum(a>b) > > > > it just doesn't work like this > > Try > > sum(case when a>b then 1 else 0 end) > -- > Tod McQuillin -- soli-con Engineering Zanger Dipl.-Ing. (FH) Olaf Marc Zanger Lorrainestrasse 23 3013 Bern / Switzerland Fon: +41-31-332 9782 Mob: +41-76-572 9782 mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] http://www.soli-con.com
Re: [SQL] sum(bool)?
Olaf Zanger writes: > i'd like to add up the "true" values of a comparison like > > sum(a>b) sum(case when a>b then 1 else 0 end) of maybe even just select count(*) from table where a>b; -- Peter Eisentraut [EMAIL PROTECTED] http://yi.org/peter-e/
Re: [SQL] sum(bool)?
On Fri, 23 Feb 2001, Olaf Zanger wrote: > i'd like to add up the "true" values of a comparison like > > sum(a>b) > > it just doesn't work like this Try sum(case when a>b then 1 else 0 end) -- Tod McQuillin
[SQL] sum(bool)?
> "Olaf" == Olaf Zanger <[EMAIL PROTECTED]> writes: Olaf> hi there i'd like to add up the "true" values of a Olaf> comparison like Olaf> sum(a>b) Olaf> it just doesn't work like this Olaf> any workaround Try using a case statement: select sum(case when a > b then 1 else 0 end) -Dan
[SQL] sum(bool)?
hi there i'd like to add up the "true" values of a comparison like sum(a>b) it just doesn't work like this any workaround postgres 7.0 on linux thanks olaf -- soli-con Engineering Zanger Dipl.-Ing. (FH) Olaf Marc Zanger Lorrainestrasse 23 3013 Bern / Switzerland Fon: +41-31-332 9782 Mob: +41-76-572 9782 mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] http://www.soli-con.com
