$sum
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What is $sum?
The $sum aggregation operator calculates the total sum of numeric values across grouped documents or array elements. It's commonly used with $group to aggregate numeric data, create totals, and perform mathematical operations in aggregation pipelines. $sum ignores non-numeric values and can sum field values, literal numbers, or results from expressions, making it essential for financial and statistical calculations.
Free resources to learn $sum
- Official docs$sum
- Official docsAggregation Operators
More in stage 9: Developer Tools
$sum: common questions
Can I learn $sum in Hindi?
This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain $sum in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.
Is this $sum tutorial for beginners?
It is lesson 85 of 106 in the free MongoDB roadmap, in stage 9, Developer Tools. If you are new to MongoDB, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.