Tutorial by Examples: aggregation

Using the Cars Table, we will calculate the total, max, min and average amount of money each costumer spent and haw many times (COUNT) she brought a car for repairing. Id CustomerId MechanicId Model Status Total Cost SELECT CustomerId, SUM(TotalCost) OVER(PARTITION BY Cust...

Payments Table CustomerPayment_typeAmountPeterCredit100PeterCredit300JohnCredit1000JohnDebit500 select customer, sum(case when payment_type = 'credit' then amount else 0 end) as credit, sum(case when payment_type = 'debit' then amount else 0 end) as debit from payments group by ...

The modules of a multi-module project are aggregated from a hierarchical structure. The root pom packing should look like: <packaging>pom</packaging> The following will be the directory structure of the project: |-- sample-app \ `-- pom.xml |-- sample-module-1 | `--...

Aggregation operations computes a single value from a collection of values. Aggregate Performs a custom aggregation operation on the values of a collection. Method Syntax // Aggregate var numbers = new int[] { 1, 2, 3, 4, 5 }; var product = numbers.Aggregate(1, (acc, n) => acc * n);...

Suppose you have a hot observable for which you would love to keep the count of. It could be the IObservable<StockTick> and you want to keep count of the average trade volume. You can use Scan for that. var tradeVolume = stockTicks.Select(e => e.Price) .Scan(0.0m, (aggregated, newtick...

Using the Library Database, we try to find the last book added to the database for each author. For this simple example we assume an always incrementing Id for each record added. SELECT MostRecentBook.Name, MostRecentBook.Title FROM ( SELECT Authors.Name, Books.Title, ...

Andrew Mao's solution. Average Aggregation Queries in Meteor Meteor.publish("someAggregation", function (args) { var sub = this; // This works for Meteor 0.6.5 var db = MongoInternals.defaultRemoteCollectionDriver().mongo.db; // Your arguments to Mongo's aggregation...

Description The SQL standard provides two additional aggregate operators. These use the polymorphic value "ALL" to denote the set of all values ​​that an attribute can take. The two operators are: with data cube that it provides all possible combinations than the argument attributes o...

=QUERY(QUERY(A1:D6,"select C,SUM(D) group by C",1),"select Col2>0",1)

Another way of doing aggregations is by using the Mongo.Collection#rawCollection() This can only be run on the Server. Here is an example you can use in Meteor 1.3 and higher: Meteor.methods({ 'aggregateUsers'(someId) { const collection = MyCollection.rawCollection() const aggre...

XmlView: <mvc:View controllerName="sap.m.sample.ListCounter.List" xmlns:mvc="sap.ui.core.mvc" xmlns="sap.m"> <List headerText="Products" items="{products>/Products}"> <!-- Template of ...

<mvc:View controllerName="sap.m.sample.ListCounter.List" xmlns:mvc="sap.ui.core.mvc" xmlns="sap.m"> <List headerText="Fruits" items="{path:'products>/Products', sorter:{path:'Name'}, filter:{path:'Type', o...

XmlView: <mvc:View controllerName="sap.ui.demo.wt.controller.App" xmlns="sap.m" xmlns:mvc="sap.ui.core.mvc" displayBlock="true"> <App> <pages> <Page content="{path:'Tiles>/Tiles',fact...

Given the CSV file peoples.csv: 1,Reed,United States,Female 2,Bradley,United States,Female 3,Adams,United States,Male 4,Lane,United States,Male 5,Marshall,United States,Female 6,Garza,United States,Male 7,Gutierrez,United States,Male 8,Fox,Germany,Female 9,Medina,United States,Male 10,Nich...

let col_1 = db.collection('col_1'); let col_2 = db.collection('col_2'); col_1 .aggregate([ { $match: { "_id": 1 } }, { $lookup: { from: "col_2", localField: "id", foreignField: "id", ...

We have a Student table with SubjectId. Here the requirement is to concatenate based on subjectId. All SQL Server versions create table #yourstudent (subjectid int, studentname varchar(10)) insert into #yourstudent (subjectid, studentname) values ( 1 ,'Mary' ) ,( 1 ,'John' ...

In case of SQL Server 2017 or vnext we can use in-built STRING_AGG for this aggregation. For same student table, create table #yourstudent (subjectid int, studentname varchar(10)) insert into #yourstudent (subjectid, studentname) values ( 1 ,'Mary' ) ,( 1 ,'John' ) ,( 1 ...

This is a single value metrics aggregation that calculates the average of the numeric values that are extracted from the aggregated documents. POST /index/_search? { "aggs" : { "avd_value" : { "avg" : { "field" : "name_of_field" } } ...

A single-value metrics aggregation that calculates an approximate count of distinct values. Values can be extracted either from specific fields in the document or generated by a script. POST /index/_search?size=0 { "aggs" : { "type_count" : { "ca...

A multi-value metrics aggregation that computes stats over numeric values extracted from the aggregated documents. These values can be extracted either from specific numeric fields in the documents, or be generated by a provided script. The extended_stats aggregations is an extended version of the ...