Cohort Analysis by month - MySQL -


hi trying cohort analysis year 2017. have following 2 tables

  1. firstpurchases - determine first purchase client has made greater 1. reason have credit card verification purchases less 1 usd upon first transaction.

  2. transaction - table records purchasing , refund transactions customers.

the sql have written following 

drop table if exists `firstpurchases`; create table `firstpurchases` ( select account_id,min(created_date) transaction_date `transaction` transaction.amount > 1 group  account_id );  delete `firstpurchases` year(transaction_date) = 2016;   select u.monthoffset month,    sum(s.monthoffset = 0) d0,   sum(s.monthoffset = 1) d1,   sum(s.monthoffset = 2) d2,   sum(s.monthoffset = 3) d3,   sum(s.monthoffset = 4) d4,   sum(s.monthoffset = 5) d5,   sum(s.monthoffset = 6) d6,   sum(s.monthoffset = 7) d7,   sum(s.monthoffset = 8) d8,   sum(s.monthoffset = 9) d9,   sum(s.monthoffset = 10) d10,   sum(s.monthoffset = 11) d11,   sum(s.monthoffset = 12) d12  (  select     account_id,     month(transaction_date) monthoffset   `firstpurchases`   transaction_date >= curdate() - datediff(curdate(),'2017-01-01') ) u left join (     select distinct     transaction.account_id,     period_diff(date_format(transaction.created_date,'%y%m'),date_format(firstpurchases.transaction_date,'%y%m')) monthoffset     `transaction`     left join `firstpurchases`  on (transaction.account_id = `firstpurchases`.account_id)     `transaction`.created_date >= curdate() - datediff(curdate(),'2017-01-01') ) s on s.account_id = u.account_id group u.monthoffset;

although confident d0 correct. rest of numbers feel inflated me. have gone through exercise manually , figures dont match up. can maybe cast eye , see went wrong ? appreciated.

so turns out bit of dumbass , query correct. forgot filter out refunds in left join. if wants use template cohort analysis there u go :)


Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer
Read more

jquery - Responsive Navbar with Sub Navbar -

good day, forgive me nav vocabulary not best. if question confusing apologize. i'm working on navigation bar needs centered on page @ 768px , above. items in nav open (or perhaps toggle) subnav lives directly below. these nav should appear centered on page. i have been able work through responsive portion of nav bar, having main items align vertically , sub nav menu of each item roll out below, , gave them indent separation. working well. however, issue not responsive side, behavior @ width greater 768px. happens toggling menu's sub navigation pushes other main items down page below sub nav. here's code: $(document).ready(function () { //stick in fixed 100% height behind navbar don't wrap $('#slide-nav.navbar-inverse').after($('<div class="inverse" id="navbar-height-col"></div>')); $('#slide-nav.navbar-default').after($('<div id="navbar-height-col"></d
Read more