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The DISTINCT clause in SQL is used to remove duplicate values from a result set. It ensures that the returned values are unique.
Example
SELECT DISTINCT Country FROM Customers;This query will return all the unique countries from the "Customers" table1.
Using DISTINCT with Multiple Columns
When using DISTINCT with multiple columns, it considers the combination of values in those columns to evaluate duplicates2.
SELECT DISTINCT Country, City FROM Customers;This query will return unique combinations of countries and cities from the "Customers" table.
Using DISTINCT with COUNT()
The DISTINCT clause can also be used with the COUNT() function to count the number of unique values2.
SELECT COUNT(DISTINCT Country) FROM Customers;This query will return the number of unique countries in the "Customers" table.
Handling NULL Values
The DISTINCT clause treats all NULL values as a single unique value3.
SELECT DISTINCT Age FROM students; SQL Distinct Clause - GeeksforGeeks
The distinct keyword is used in conjunction with the select keyword. It is helpful when there is a need to avoid duplicate values present in any specific columns/table. When we use distinct keywords only the unique valuesare fetched. Syntax: Parameters Used: 1. column1, column2: Names of the fields of the table. 2. … See more
There is a Table in SQL with names of students with Rollno, Name, Address, Phone and Age. We will see some examples of using … See more
In SQL, the DISTINCT keyword treats NULLas a unique value. If NULL appears in a column, it will be counted as a distinct value. Query: Output: See more
The SQL DISTINCT keyword is an essential tool for removing duplicates and fetching unique data from your tables. It can be used with a single column or multiple columns and … See more
SQL SELECT DISTINCT Statement - W3Schools
The SQL SELECT DISTINCT Statement. The SELECT DISTINCT statement is used to return only distinct (different) values.
What Is the Role of DISTINCT in SQL? - LearnSQL.com
Apr 23, 2021 · By default, SQL queries show all the returned rows, including duplicate rows, in the result set. The DISTINCT keyword in the SELECT …
How to Use the DISTINCT Clause in SQL - Database.Guide
Oct 21, 2023 · We can use the DISTINCT keyword inside the COUNT() function in order to get a count of the unique values, without having to return the actual data itself. Example: SELECT …
SQL DISTINCT - SQL Tutorial
To select the distinct values from a column of a table, you use the DISTINCT operator in the SELECT clause as follows: column1. FROM . table_name; Code language: SQL (Structured …
SQL DISTINCT Explained [Practical Examples]
Nov 4, 2022 · SQL Distinct keyword is used with SQL Select operation to eliminate duplicate rows from the result set and is specified before the column name with the SQL Select statement to fetch only the unique values of a …
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Distinct clause in MS SQL Server - GeeksforGeeks
Apr 18, 2023 · In SQL Server, distinct is a term used to remove duplicates from a table. Syntax. SELECT DISTINCT column1, column2, … Parameter Explanation. DISTINCT: It will return …
An In-Depth Guide to SQL SELECT DISTINCT …
Jan 21, 2024 · What is a SELECT DISTINCT Statement in SQL? The SELECT DISTINCT statement is used to retrieve unique records from the database. It filters out duplicate values in the result set, ensuring that every row returned is …
How to Use DISTINCT in SQL - LearnSQL.com
The DISTINCT clause is used in the SELECT statement to filter out duplicate rows in the result set. You can use DISTINCT when you select a single column, or when you select multiple columns as we did in our example.
SQL DISTINCT Clause - Tutorial Republic
The DISTINCT clause is used to remove duplicate rows from the result set: Here, column_list is a comma separated list of column or field names of a database table (e.g. name, age, country, …
SQL Distinct Explained with Examples: A Comprehensive Guide
Apr 23, 2024 · One of the key concepts in SQL is the DISTINCT keyword, which allows you to retrieve unique values from a table. In this in-depth guide, we‘ll explore the power of …
SQL DISTINCT: The Complete Guide - Database Star
Aug 16, 2023 · DISTINCT is a keyword in SQL that allows you to show unique or distinct results. It’s added to a SELECT query to eliminate duplicates in the data it displays because columns …
How to use SQL SELECT DISTINCT - IONOS CA
Feb 26, 2025 · SQL SELECT DISTINCT ensures that only unique records and rows are included in the results of a data query. It removes duplicates from the records and rows in question, …
What’s the SQL Distinct Statement and How Does it Work?
The DISTINCT is used to select only specific values from a certain column in a database table. The clause is also used to eliminate duplicates returned by a SELECT statement. A statement …
SQL: DISTINCT Clause - TechOnTheNet
This SQL tutorial explains how to use the SQL DISTINCT clause with syntax and examples. The SQL DISTINCT clause is used to remove duplicates from the result set of a SELECT statement.
MySQL DISTINCT Clause Explained: Why, How & When
Oct 10, 2024 · In essence, a MySQL DISTINCT clause eliminates all duplicates and provides only unique results. Some may link it to the capabilities of a UNIQUE INDEX and they wouldn’t be …
DISTINCT clause - SQL for Geeks
The DISTINCT rule in SQL removes duplicate rows from the result set of a query. What is the distinct clause in SQL performance? Using DISTINCT in SQL can impact performance by …
SQL Server T-SQL SELECT DISTINCT Clause Tutorial
Mar 30, 2022 · The DISTINCT clause is an optional part of the SELECT statement and returns a set of unique records based on the columns included in the SELECT list. When it comes to …
How to Use Select Distinct in SQL: A Simple Guide for Efficient ...
Sep 24, 2023 · If you’re not familiar already, SELECT DISTINCT is a handy tool in our SQL arsenal that helps to return unique values within a database column. Here’s how we can use it …
SQL SELECT DISTINCT Statement - Tutorial Gateway
The SQL Server DISTINCT Statement retrieves unique records (by removing the duplicates) from the specified column in the SELECT Statement. The syntax of the SELECT DISTINCT …
Distinct in SQL: A Comprehensive Guide - DbVisualizer
Jan 11, 2024 · SQL DISTINCT is a valuable tool for obtaining unique or distinct values from a database table. Assume your company has a database that contains orders placed by …
SQL Query Optimization: Everything You Need to Know
6 days ago · SQL DISTINCT is a clause used to remove duplicate rows from a result set, ensuring only unique values are returned. It is particularly useful when retrieving distinct values from a …
SQL Aggregate Functions: Syntax, Use Cases, and Examples
Mar 31, 2025 · SQL aggregation and its importance in query performance . While SQL server aggregate functions simplify data analysis, poor query design can lead to performance …
CREATE TYPE (distinct) statement - IBM
In cases in which the source type is a parameterized type, the function to convert from the distinct type to the source type will have as function name the name of the source type without the …
SQL SELECT DISTINCT 语句详解：精准去重的艺术 - CSDN博客
4 days ago · 文章浏览阅读569次，点赞14次，收藏11次。DISTINCT是 SQL 中的一个关键字，用于从查询结果中去除重复的记录。当你只关心查询结果中每个唯一值时，DISTINCT能有效地 …
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