---
title: "Finding Duplicates in SQL"
url: https://daily.dev/posts/finding-duplicates-in-sql-zcs2mmthu
source_url: https://www.sqlshack.com/finding-duplicates-in-sql/
type: article
source: "SQL Shack"
published: 2024-02-07T11:16:58.060Z
updated: 2024-05-09T09:21:59.549Z
tags: ["database", "sql", "data-processing", "data-warehouse"]
reading_time: 7
upvotes: 23
comments: 0
language: en
---

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# Finding Duplicates in SQL

**[SQL Shack](https://daily.dev/sources/sqlshack)** · 7 min read · 23 upvotes · 0 comments

## Summary

This post explains the different ways to find duplicate values in SQL using DISTINCT and COUNT, GROUP BY and COUNT, and ROW_NUMBER functions. It provides examples and guidance on how to use these functions to identify duplicates in single columns or across multiple columns. The post also highlights the importance of managing duplicates in data storage and processing.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://www.sqlshack.com/finding-duplicates-in-sql/>

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---

Tags: [#database](https://daily.dev/tags/database), [#sql](https://daily.dev/tags/sql), [#data-processing](https://daily.dev/tags/data-processing), [#data-warehouse](https://daily.dev/tags/data-warehouse)

[View this post on daily.dev](https://daily.dev/posts/finding-duplicates-in-sql-zcs2mmthu)