Re: function to limit value of integer
log(2, no_of_jobs + 1) will give 0 for 0 jobs, 1 for 1 job, 1.58 for 2 etc. etc. On 11 Feb 2011, at 14:04, Johan De Meersman wrote: > How about the square root of the number of jobs, or some other root if you > want another coefficient? That doesn't have the limiting behaviour a > logarithmic function offers, though. > > On Fri, Feb 11, 2011 at 2:08 PM, Richard Reina wrote: > >> Hi Travis, >> >> This is very helpful thank you. However, is there a way to make it not be >> less than a 1. As it's written below someone with one job gets a zero and >> someone with no jobs gets a NULL. It would be great if someone with 1 job >> got a 1 and someone with zero jobs got a 0. >> >> Thanks again, >> >> Richard >> >> 2011/2/10 Travis Ard >> >>> Maybe some sort of logarithmic expression? >>> >>> select no_of_jobs, 10 * log(10, no_of_jobs) as job_weight >>> from data; >>> >>> Of course, you'd have to tweak your coefficients to match the weighting >>> system you want to use. >>> >>> -Travis >>> >>> -Original Message- >>> From: Richard Reina [mailto:gatorre...@gmail.com] >>> Sent: Thursday, February 10, 2011 3:07 PM >>> To: mysql@lists.mysql.com >>> Subject: function to limit value of integer >>> >>> Is there a function that can limit the value of an integer in a MySQL >>> query? I am trying to write a query that scores someones experience. >>> However, number of jobs can become overweighted in the the query below. >> If >>> someone has done 10 jobs vs. 1 that's a big difference in experience. But >>> someone who's done 100 vs. someone who's done 50 the difference in >>> experience is not so great as they are both near the top of the learning >>> curve. In essence number of jobs becomes less and less of a contributor >> as >>> it increases. Is there a way to limit it's value as it increases? >>> >>> SELECT years_srvd + no_of_jobs AS EXPERIENCE >>> >>> Thanks, >>> >>> Richard >>> >>> >> > > > > -- > Bier met grenadyn > Is als mosterd by den wyn > Sy die't drinkt, is eene kwezel > Hy die't drinkt, is ras een ezel -- TTFN. Philip Riebold, p.rieb...@ucl.ac.uk /"\ Media Services\ / University College London X ASCII Ribbon Campaign Windeyer Building, 46 Cleveland Street/ \ Against HTML Mail London, W1T 4JF +44 (0)20 7679 9259 (direct), 09259 (internal) -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: function to limit value of integer
How about the square root of the number of jobs, or some other root if you want another coefficient? That doesn't have the limiting behaviour a logarithmic function offers, though. On Fri, Feb 11, 2011 at 2:08 PM, Richard Reina wrote: > Hi Travis, > > This is very helpful thank you. However, is there a way to make it not be > less than a 1. As it's written below someone with one job gets a zero and > someone with no jobs gets a NULL. It would be great if someone with 1 job > got a 1 and someone with zero jobs got a 0. > > Thanks again, > > Richard > > 2011/2/10 Travis Ard > > > Maybe some sort of logarithmic expression? > > > > select no_of_jobs, 10 * log(10, no_of_jobs) as job_weight > > from data; > > > > Of course, you'd have to tweak your coefficients to match the weighting > > system you want to use. > > > > -Travis > > > > -Original Message- > > From: Richard Reina [mailto:gatorre...@gmail.com] > > Sent: Thursday, February 10, 2011 3:07 PM > > To: mysql@lists.mysql.com > > Subject: function to limit value of integer > > > > Is there a function that can limit the value of an integer in a MySQL > > query? I am trying to write a query that scores someones experience. > > However, number of jobs can become overweighted in the the query below. > If > > someone has done 10 jobs vs. 1 that's a big difference in experience. But > > someone who's done 100 vs. someone who's done 50 the difference in > > experience is not so great as they are both near the top of the learning > > curve. In essence number of jobs becomes less and less of a contributor > as > > it increases. Is there a way to limit it's value as it increases? > > > > SELECT years_srvd + no_of_jobs AS EXPERIENCE > > > > Thanks, > > > > Richard > > > > > -- Bier met grenadyn Is als mosterd by den wyn Sy die't drinkt, is eene kwezel Hy die't drinkt, is ras een ezel
Re: function to limit value of integer
Hi Travis, This is very helpful thank you. However, is there a way to make it not be less than a 1. As it's written below someone with one job gets a zero and someone with no jobs gets a NULL. It would be great if someone with 1 job got a 1 and someone with zero jobs got a 0. Thanks again, Richard 2011/2/10 Travis Ard > Maybe some sort of logarithmic expression? > > select no_of_jobs, 10 * log(10, no_of_jobs) as job_weight > from data; > > Of course, you'd have to tweak your coefficients to match the weighting > system you want to use. > > -Travis > > -Original Message- > From: Richard Reina [mailto:gatorre...@gmail.com] > Sent: Thursday, February 10, 2011 3:07 PM > To: mysql@lists.mysql.com > Subject: function to limit value of integer > > Is there a function that can limit the value of an integer in a MySQL > query? I am trying to write a query that scores someones experience. > However, number of jobs can become overweighted in the the query below. If > someone has done 10 jobs vs. 1 that's a big difference in experience. But > someone who's done 100 vs. someone who's done 50 the difference in > experience is not so great as they are both near the top of the learning > curve. In essence number of jobs becomes less and less of a contributor as > it increases. Is there a way to limit it's value as it increases? > > SELECT years_srvd + no_of_jobs AS EXPERIENCE > > Thanks, > > Richard > >
RE: function to limit value of integer
Maybe some sort of logarithmic expression? select no_of_jobs, 10 * log(10, no_of_jobs) as job_weight from data; Of course, you'd have to tweak your coefficients to match the weighting system you want to use. -Travis -Original Message- From: Richard Reina [mailto:gatorre...@gmail.com] Sent: Thursday, February 10, 2011 3:07 PM To: mysql@lists.mysql.com Subject: function to limit value of integer Is there a function that can limit the value of an integer in a MySQL query? I am trying to write a query that scores someones experience. However, number of jobs can become overweighted in the the query below. If someone has done 10 jobs vs. 1 that's a big difference in experience. But someone who's done 100 vs. someone who's done 50 the difference in experience is not so great as they are both near the top of the learning curve. In essence number of jobs becomes less and less of a contributor as it increases. Is there a way to limit it's value as it increases? SELECT years_srvd + no_of_jobs AS EXPERIENCE Thanks, Richard -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
function to limit value of integer
Is there a function that can limit the value of an integer in a MySQL query? I am trying to write a query that scores someones experience. However, number of jobs can become overweighted in the the query below. If someone has done 10 jobs vs. 1 that's a big difference in experience. But someone who's done 100 vs. someone who's done 50 the difference in experience is not so great as they are both near the top of the learning curve. In essence number of jobs becomes less and less of a contributor as it increases. Is there a way to limit it's value as it increases? SELECT years_srvd + no_of_jobs AS EXPERIENCE Thanks, Richard
