aggregate-functions

I have a table like this: +-----+----------------+ | ID | array300 | +-----+----------------+ | 100 | {110,25,53,..} | | 101 | {56,75,59,...} | | 102 | {65,93,82,...} | | 103 | {75,70,80,...} | +-----+----------------+ array300 column is an array of 300 elements. I need to have arrays of 100 elements with every element representing the average of 3 elements of array300 . For this example the answer will be like: array100 {62.66,...} {63.33,...} {80,...} {78.33,...} Try something like this: SELECT id, unnest(array300) as val, ntile(100) OVER (PARTITION BY id) as bucket_num FROM your_table This

From a previous post, I have the following view in sqlite3: CREATE View AttendeeTableView AS SELECT (LastName || " " || FirstName) as AttendeeName, CompanyName, PhotoURI, CompanyAttendeeRelation.CompanyId, CompanyAttendeeRelation.AttendeeId FROM Attendee JOIN CompanyAttendeeRelation on CompanyAttendeeRelation.AttendeeId = Attendee.AttendeeId ORDER BY LastName; Now, since the data is generated from a many-to-many relation between Attendee and Company , I can get results such as: Doe John | company A | johnPic.png | 1 | 15 Doe John | company B | johnPic.png | 2 | 15 What I'd like to do is, in

I have a custom CLR Aggregate function on SQL Server to calculate percentiles. Is it possible to call my custom aggregate function through Entity Framework? How is the mapping configured to allow this? I have tried using codefirstfunctions similar to what is described on Entity Framework 6 Code First Custom Functions , however the functions seem to only be allowed to take scaler parameters, where my function is an aggregate function so will need to take a list of items (similar to how Sum, Averagg and Count work). The Aggregate functions has the following signature, taking in the value we want

I am trying to produce a results table with the last completed course date for each course code, as well as the last completed course code overall for each employee. Below is my query: SELECT employee_number, MAX(course_completion_date) OVER (PARTITION BY course_code) AS max_course_date, MAX(course_completion_date) AS max_date FROM employee_course_completion WHERE course_code IN ('M910303', 'M91301R', 'M91301P') GROUP BY employee_number This query produces the following error: 3504 : Selected non-aggregate values must be part of the associated group If I remove the MAX() OVER (PARTITION BY...)

Oracle supports RETURNING clause which could be very useful. For example for data: CREATE TABLE t(Id INT, Val varchar2(50)); INSERT INTO t(Id, Val) SELECT 10,'a' FROM dual UNION ALL SELECT 20,'b' FROM dual UNION ALL SELECT 30,'a' FROM dual UNION ALL SELECT 40,'b' FROM dual; Query: DECLARE l_cnt INT; BEGIN DELETE FROM t RETURNING COUNT(*) INTO l_cnt; DBMS_OUTPUT.put_line('l_cnt: ' || l_cnt); END; l_cnt: 4 It supports MIN/MAX/AVG/SUM/LISTAGG: DECLARE l_max INT; l_min INT; l_str VARCHAR2(100); BEGIN DELETE FROM t RETURNING MAX(id), MIN(id), LISTAGG(id, ',') WITHIN GROUP(ORDER BY id) INTO l_max, l

I'm trying to achive an Aggregation Query and that's my code: TicketGroup.objects.filter(event=event).aggregate( total_group=Sum(F('total_sold')*F('final_price'))) I have 'total_sold' and 'final_price' in TicketGroup object and all what I want to do is sum and multiply values to get the total sold of all TicketGroups together. All I get is this error: Expression contains mixed types. You must set output_field What I am doing wrong, since I'm calling 'total_group' as my output field? Thanks! By output_field Django means to provide field type for the result of the Sum . from django.db.models

Given: table 'thing': age --- 3.4 3.4 10.1 40 45 49 I want to count the number of things for each 10-year range, e.g., age_range | count ----------+------- 0 | 2 10| 1 20| 0 30| 0 40| 3 This query comes close: SELECT FLOOR(age / 10) as age_range, COUNT(*) FROM thing GROUP BY FLOOR(age / 10) ORDER BY FLOOR(age / 10); Output: age_range | count -----------+------- 0 | 1 1 | 2 4 | 3 However, it doesn't show me the ranges which have 0 counts. How can I modify the query so that it also shows the ranges in between with 0 counts? I found similar stackoverflow questions for counting ranges, some for 0