sql - MySQL selecting MAX unique values -



sql - MySQL selecting MAX unique values -

i have mysql table shows sellers table looks following:

advertiseid[pk] | customerid[fk] | productsid[fk] | quantites_advertised | price_advertised ------------------------------------------------------------------------------------------ 1 2 2 4.00 2.00 2 4 3 5.00 2.50 3 3 2 1.00 1.00

the first record means ..this means client id 2 selling choclates(product id 1), 4kg's@ £2.00

i wanted select each product id query displays minimum of different products: hence, table be:

advertiseid[pk] | customerid[fk] | productsid[fk] | quantites_advertised | price_advertised ------------------------------------------------------------------------------------------ 2 4 3 5.00 2.50 3 3 2 1.00 1.00

the query outputs min cost product 2 , 3 since product 3 product cheapest cost , product 2 min between 4.00 , 1.00 1.00 hence, outputted. have various different products how able accomplish this? have tried query incorrect.:

select c.fname p.productname, s.productid, s.quantity, s.price sellers s, products p, client c s.price = (select min(price) sellers p.id=s.productid , c.id=s.cid);

anyone have thought how can accomplish expected output?

you utilize filtering inner join:

select * yourtable yt bring together ( select productsid , min(price_advertised) min_price_advertised yourtable grouping productsid ) filter on filter.productsid = yt.productsid , filter.min_price_advertised = yt.price_advertised

mysql sql distinct max

Comments

Post a Comment

Popular posts from this blog

web services - java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer -

web services - java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer - when trying request rest service @ time of response getting exception.. feb 21, 2013 2:34:49 pm com.sun.jersey.spi.container.containerresponse mapmappablecontainerexception severe: exception contained within mappablecontainerexception not mapped response, re-throwing http container java.lang.noclassdeffounderror: not initialize class net.sf.cglib.proxy.enhancer @ org.hibernate.proxy.pojo.cglib.cgliblazyinitializer.getproxyfactory(cgliblazyinitializer.java:117) @ org.hibernate.proxy.pojo.cglib.cglibproxyfactory.postinstantiate(cglibproxyfactory.java:43) @ org.hibernate.tuple.entity.pojoentitytuplizer.buildproxyfactory(pojoentitytuplizer.java:162) @ org.hibernate.tuple.entity.abstractentitytuplizer.<init>(abstractentitytuplizer.java:135) @ org.hibernate.tuple.entity.pojoentitytuplizer.<init>(pojoentitytuplizer.java:55) @ org.hibernate.tuple.e...
Read more

Accessing MATLAB's unicode strings from C -

Accessing MATLAB's unicode strings from C - how can access underlying unicode info of matlab strings through matlab engine or mex c interfaces? here's example. let's set unicode characters in utf-8 encoded file test.txt, read as fid=fopen('test.txt','r','l','utf-8'); s=fscanf(fid, '%s') in matlab. now if first feature('defaultcharacterset', 'utf-8') , c engevalstring(ep, "s") , output text file utf-8. proves matlab stores unicode internally. if mxarraytostring(enggetvariable(ep, "s")) , unicode2native(s, 'latin-1') give me in matlab: non-latin-1 characters replaced character code 26. need getting access underlying unicode info c string in unicode format (utf-8, utf-16, etc.), , preserving non-latin-1 characters. is possible? my platform os x, matlab r2012b. addendum: documentation explicitly states "[mxarraytostring()] supports multibyte encoded characters...
Read more

javascript - mongodb won't find my schema method in nested container -

javascript - mongodb won't find my schema method in nested container - i trying access method of schema stored within mixed container. here situation : have cases model can many different things, have schema each of these things stored in "casecontent" mixed property. var caseschema = mongoose.schema({ casecontent : {}, object : {type:string, default : "null"}, collision : {type : boolean, default : false} }); the casecontent property filled model of 1 of schemas, 1 exemple : var treeschema = new mongoose.schema({ applecount : {type : number, default : 3} }); treeschema.methods.dostuff = function (data) { console.log('hey, listen'); homecoming true; }; then, want utilize method of schema original container : caseschema.methods.dostuff = function (data) { if (this.casecontent.dostuff !== undefined) { this.casecontent.dostuff(); console.log('it worked'); } else { ...
Read more