![]() MongoDB has gained 96.9 since the start of the year compared to the 33. $group : ģ.3 Exports the collection “websitegroup” to a csv file.Ĭ:\> mongoexport -d testdb -c websitegroup -f _id,total -o group. The stock hit a new 52-week high of 398.89 in the previous session. Third, use an aggregation pipeline to filter the sales by the Americanos, calculate the sum of quantity grouped by sizes, and sort the result document by the total quantity in descending order.Uses db.collection.aggregate and $group to perform the data grouping.Ģ.1 The following example groups by the “hosting” field, and display the total sum of each hosting. In this article, I will explain the main principles of building aggregate queries in MongoDB and how to take advantage of indexes for speeding them up. ]) Code language: JavaScript ( javascript ) Aggregation operations group values from multiple documents together, and can perform a variety of operations on the grouped data to return a single result. The following shows the syntax for defining an aggregation pipeline:
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