---
title: "Discussion on \"5. Aggregation functions | Group By | Having \" | Hashnode"
description: "Discussion on \"5. Aggregation functions | Group By | Having \". Aggregation FunctionsFunctions that perform calculations on a set of rows and return a single value.\n\n\n\nFunction\nDescription\nExample\n\n\n\nCOUNT()\nCounts rows\nSELECT COUNT(*) FROM employees;\n\n\nSUM()\nCalc"
url: "https://hashnode.com/posts/5-aggregation-functions-group-by-having/6a4baf212f36012dc4d96e6e"
---

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# [5\. Aggregation functions | Group By | Having](https://sqlwithayush.hashnode.dev/5-aggregation-functions-group-by-having?utm_source=hashnode&utm_medium=feed)

Aggregation FunctionsFunctions that perform calculations on a set of rows and return a single value. Function Description Example COUNT() Counts rows SELECT COUNT(\*) FROM employees; SUM() Calc

Jul 6 · 8 min read · sqlwithayush.hashnode.dev  
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## Written by

[Ayush Rajput](https://hashnode.com/@ayuxsh)

@ayuxsh

  
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