sql - Using correctly HAVING with group by and COUNT -


i running query:

select u.id id,         count(distinct year(timestamp), week(timestamp)) cc,         group_concat(distinct year(timestamp),'-',week(timestamp))   users u         join checkins c           on c.userid = u.id  group  userid having count(cc) = 3

and produces following results:

id  cc  05  3   2010-43,2010-47,2010-45  06  2   2010-44,2010-45  13  3   2010-43,2010-45,2010-48  20  3   2010-45,2010-43,2010-47  21  3   2010-43,2010-47,2010-45  22  2   2010-47,2010-48  25  3   2010-48,2010-43,2010-46  27  2   2010-42,2010-47  30  2   2010-48,2010-45  41  3   2010-44,2010-45,2010-47  44  2   2010-42,2010-44  50  2   2010-44,2010-47  52  2   2010-48,2010-47  57  2   2010-43,2010-44  71  3   2010-43,2010-48,2010-47  72  2   2010-43,2010-44  78  3   2010-47,2010-42,2010-43  79  2   2010-45,2010-46  80  2   2010-46,2010-44  87  1   2010-46  97  1   2010-48  108 3   2010-43,2010-47,2010-45

as see cc column has values 2, 3, or 1.

how comes, when i've told having should 3?

mysql allow aliases in having clause. need use:

having cc = 3

not 

having count(cc) = 3

in order filter results include rows have cc value of 3 though. i'm quite unsure though why having count(cc) = 3 return results @ all.


Comments

Post a Comment

Popular posts from this blog

asp.net - repeatedly call AddImageUrl(url) to assemble pdf document -

i'm using abcpdf , i'm curious if can recursively call addimageurl() function assemble pdf document compile multiple urls? something like: int pagecount = 0; int theid = thedoc.addimageurl("http://stackoverflow.com/search?q=abcpdf+footer+page+x+out+of+", true, 0, true); //assemble document while (thedoc.chainable(theid)) { thedoc.page = thedoc.addpage(); theid = thedoc.addimagetochain(theid); } pagecount = thedoc.pagecount; console.writeline("1 document page count:" + pagecount); //flatten document (int = 1; <= pagecount; i++) { thedoc.pagenumber = i; thedoc.flatten(); } //now try again theid = thedoc.addimageurl("http://stackoverflow.com/questions/1980890/pdf-report-generation", true, 0, true); //assemble document while (thedoc.chainable(theid)) { thedoc.page = thedoc.addpage(); theid = thedoc.addimagetoc
Read more

java - Android recognize cell phone with keyboard or not? -

in android app, want detect user's device if device has keyboard(like motorola milestone) , show corresponding user interface. guys know how that? ! regards justicepenny http://developer.android.com/reference/android/content/res/configuration.html public int keyboard the kind of keyboard attached device. 1 of: keyboard_nokeys, keyboard_qwerty, keyboard_12key. that's it!
Read more

iphone - How would you achieve a LED Scrolling effect? -

how achieve led scrolling effect example below? led sign - led ticker emulator iphone , ipad http://img.skitch.com/20101201-rsfh4p1bajb1wp94k466pdpiuj.preview.jpg sometimes remunerates comment in other posts :) have put code you, should implement font '8pin matrix' realistic feeling. uilabel *label; - (void)viewdidload { [super viewdidload]; label = [[uilabel alloc]initwithframe:cgrectmake(10, 50, 300, 20)]; label.font = [uifont fontwithname:@"courier-bold" size:16.0]; label.backgroundcolor = [uicolor blackcolor]; label.textcolor = [uicolor greencolor]; label.linebreakmode = uilinebreakmodecharacterwrap; // otherwise "…" label.text = @"this led text scrolled "; // blanks space between [self.view addsubview:label]; [nstimer scheduledtimerwithtimeinterval:0.12f target:self selector:@selector(scrolllabel) use
Read more