Handling Duplicates

How To Use Handling Duplicates In SQL

Introduction:
Today, in this article, you will learn what is Handling Duplicates and how to use Handling Duplicates in SQL.

In the SQL tables, sometimes we have one or more same records in one table. And in some conditions, it is necessary to remove these duplicate records. The distinct keyword is used in to delete all the duplicate records in the table and take only particular records.

Example:

Here, we have an Employee table for applying the Duplicate queries:

Syntax:

The basic syntax of the Distinct keyword to show duplicate data is as follows:

select distinct column1, column2,.... from table_name where [condition];

Step 1: First we will write the query of showing duplicate data with the Distinct keyword.

select Age from employee order by Age;

Now, select and execute this query.

Step 2: And the output of this query is:

Then, we remove the Duplicate data within the tables.

Step 1: First we will write the query for removing data with the Distinct keyword.

select distinct Age from employee order by Age;

Now, select and execute this query.

Step 2: And the output of this query is:

Summary:
Thus, we learned that duplicate handling is used to remove the duplicate records and also learn its use in SQL.