Top "Aggregation" questions

Aggregation is a relationship between two classes that is best described as a "has-a" and "whole/part" relationship.

Convert strings to floats at aggregation time?

Is there any way to convert strings to floats when specifying a histogram aggregation? Because I have documents with fields …

string elasticsearch sum aggregation
How to release Maven multi-module project with inter-project dependencies?

Lets say we have 3 layers project. DB, Business, Web and aggregating pom. Project |-DB | |-pom.xml |-Business | |-pom.xml |-pom.…

maven aggregation dependency-management maven-release-plugin multi-module
Aggregate bitwise-OR in a subquery

Given the following table: CREATE TABLE BitValues ( n int ) Is it possible to compute the bitwise-OR of n for all …

sql-server sql-server-2005 tsql aggregation
Pandas: Average value for the past n days

I have a Pandas data frame like this: test = pd.DataFrame({ 'Date' : ['2016-04-01','2016-04-01',…

python pandas time-series aggregation
When to use association, aggregation, composition and inheritance?

I've seen plenty of posts on Stackoverflow explaining the difference between the relationships: associations, aggregation, composition and inheritance, with examples. …

python inheritance associations aggregation composition
Sum of the grouped distinct values

This is a bit hard to explain in words ... I'm trying to calculate a sum of grouped distinct values in …

reportingservices-2005 aggregation
How do you get average of sums in SQL (multi-level aggregation)?

I have a simplified table xx as follows: rdate date rtime time rid integer rsub integer rval integer primary key …

sql db2 mainframe aggregation multi-level
Elasticsearch Terms or Cardinality Aggregation - Order by number of distinct values

Friends, I am doing some analysis to find unique pairs from 100s of millions of documents. The mock example is …

elasticsearch aggregation cardinality
How is an aggregator built?

Let's say I want to aggregate information related to a specific niche from many sources (could be travel, technology, or …

web-services aggregation web-crawler nutch
Counting the number of rows with a value greater than or equal to a value from another column in SQL

I have a table with two columns: a couple id and a number of "marks" for that couple. I'd like …

sql database aggregate-functions aggregation