python - Sum same column in different ways depending on other column - Django ORM -

-

i have following table assignment structure:

| employee | product | process | qty | | swati    | prod1   | issue   |  60 | | rohit    | prod1   | issue   |  30 | | rohit    | prod2   | issue   |  40 | | swati    | prod1   | receive |  40 | | swati    | prod2   | issue   |  70 |

i want final table each employee (say employee = 'swati'):

| product | sum_issued | sum_received | prod1   |         60 |           40 | | prod2   |         70 |            0 |

the sql query is:

select product      , sum(case when process='issue' qty else 0 end) sum_issued      , sum(case when process='receive' qty else 0 end) sum_received    assignment   employee = 'swati'   group      product;

what should django query be, corresponding result?

i guess model name 'assignment'. can use below query

from django.db.models import case, value, when, sum, integerfield, count  result = assignment.objects.filter(employee="swati").values('product').annotate(     sum_issued=sum(         case(when(process='issue', then='qty'), default=value(0), output_field=integerfield())),     sum_recived=sum(case(when(process='receive', then='qty'), default=value(0), output_field=integerfield()))     )

if print above query print result.query , result is,

select "product", sum(case when "process" = issue "qty" else 0 end) "sum_issued", sum(case when "process" = receive "qty" else 0 end) "sum_recived" "assignment" "employee" = 'swati' group "product"

Comments

Post a Comment

Popular posts from this blog

java - Static nested class instance -

-
this question has answer here: java inner class , static nested class 23 answers i came across in java, know static nested class why create instance of 'static'. isn't whole idea of 'static' use without instance? understand concept of inner classes, why (and frankly how possible to) create 'instance' of 'static' member @ ? why this: 1- outerclass.staticnestedclass nestedobject = new outerclass.staticnestedclass(); 2- nestedobject.anestedclassmethod(); and not this: 1- outerclass outerinstance=new outerclass(); 2- outerinstance.staticnestedclass.anestedclassmethod(); use on inner classes, keyword static indicates can access inner class without instance of outer class. for example: public class outer { public static class inner { /* code here. */ } } with construction, can create instance of inn
Read more

c# - Bluetooth LE CanUpdate Characteristic property -

-
i building xamarin.forms cross platform mobile app, uses monkey.robotics bluetoth low energy functionality. connecting mbed based implimentation of custom gatt service . in xamarin c#, triggers characteristic. canupdate property in monkey.robotics? this standard example c# based on: if (characteristic.canupdate) { characteristic.valueupdated += (s, e) => { debug.writeline("characteristic.valueupdated"); device.begininvokeonmainthread( () => { updatedisplay(characteristic); }); isbusy = false; // spin until first result received }; isbusy = true; characteristic.startupdates(); } this has been working, since changed own custom gatt service connecting to, canupdate property false. property , how triggered? me debugging gatt service code. thanks monkey.robotics open sour
Read more

JavaScript - Replace variable from string in all occurrences -

-
ok, know if have character '-' , want remove in places in string javascript, ... someword = someword.replace(/-/g, ''); but, when applying array of characters, s not working ... const badchars = ('\/:*?"<>|').split(''); let filename = title.replace(/ /g, '-').tolocalelowercase(); (let item = 0; item < badchars.length; item++) { // below not work global '/ /g' filename = filename.replace(/badchars[item]/g, ''); } any ideas? /badchars[item]/g looks badchars , literally, followed i , t , e , or m . if you're trying use character badchars[item] , you'll need use regexp constructor, , you'll need escape regex-specific characters. escaping regular expression has been well-covered . using that: filename = filename.replace(new regexp(regexp.quote(badchars[item]), 'g'), ''); but , don't want that. want character class: let filename = title.replac
Read more