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In SQL, the terms DISTINCT and UNIQUE serve different purposes, despite their similar meanings in everyday language. Understanding their distinct roles is crucial for effective database management.
DISTINCT Keyword
The DISTINCT keyword is used in the SELECT statement to remove duplicate rows from the result set. It ensures that the output contains only unique rows based on the specified columns. This is particularly useful when you want to retrieve a list of unique values from a table that may contain duplicates.
Example:
Consider a table named Cars with the following data:
| Id | Brand | Model | ProductionYear | |------|-------|---------|----------------| | AQ16 | Audi | Q7 | 2011 | | FK19 | Ford | Kuga | 2019 | | JC07 | Jeep | Cherokee| 2012 | | JW15 | Jeep | Wrangler| 2015 | | TS14 | Tesla | Model S | 2014 | | TY20 | Tesla | Model Y | 2020 |
To get a list of unique car brands produced after 2011, you can use the following query:
What’s the Difference Between UNIQUE and DISTINCT in SQL?
May 20, 2021 · The UNIQUE keyword in SQL plays the role of a database constraint; it ensures there are no duplicate values stored in a particular column or a set of columns. On the other hand, the DISTINCT keyword is used in the SELECT statement to fetch distinct rows from a table. …
Difference between Select Unique and Select Distinct
Oct 27, 2014 · In SQL, the UNIQUE keyword prevents two records in a column from having the same values, while the DISTINCT keyword removes duplicate values when retrieving data. …
Difference Between UNIQUE and DISTINCT in MySQL
See more on mysqlcode.comUnique and distinct are synonyms for each other. However, these two have different meanings in MySQL. The UNIQUE and DISTINCT clausesmake sure that the values are not duplicated but at different places. The UNIQUE in MySQL is one of the database constraints. Which means it plays a role to set the rules on the d…Difference between SQL SELECT UNIQUE and …
Jan 16, 2024 · The SQL SELECT DISTINCT is ANSI standard SQL statement that is used for the same purpose to get unique values from a column that may have duplicate values. This syntax can be used in multiple database systems, …
What is the Difference Between Unique and Distinct in …
Jul 2, 2019 · Unique and Distinct are two SQL constraints. The main difference between Unique and Distinct in SQL is that Unique helps to ensure that all the …
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SQL DISTINCT vs. UNIQUE | Pure Storage Blog
Aug 9, 2023 · The major difference between the DISTINCT and UNIQUE statements is that DISTINCT works on queries and UNIQUE sets an attribute on a table column. They do not have the same functionality, but they serve the …
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What is the Difference Between Unique and Distinct
Feb 5, 2025 · The SELECT DISTINCT keyword can be used to retrieve unique field data from tables in conjunction with conditions, such as particular columns. Requesting unique values from fields can be done for a variety of reasons.
Understanding SQL SELECT UNIQUE and SELECT DISTINCT
Jan 18, 2025 · In simple terms, both SELECT UNIQUE and SELECT DISTINCT are used to fetch distinct rows from a table by eliminating duplicates. However, modern SQL practitioners are …
Mastering Data Integrity: The Distinct vs Unique Keywords in SQL
Distinct and Unique keywords play a critical role in ensuring data accuracy and integrity in SQL databases. By using the DISTINCT keyword, we can eliminate duplicate rows from result sets, …
MySQL DISTINCT Clause - GeeksforGeeks
Jun 25, 2024 · A UNIQUE constraint in MySQL ensures that all values in a column or a set of columns are distinct from one another. This constraint is used to prevent duplicate entries in a column or combination of columns, …
sql distinct vs unique - Trust In Geeks
Jul 10, 2023 · Difference Between Unique and Distinct. In summary, while UNIQUE and DISTINCT both aim at dealing with duplicates, they do so in different contexts. UNIQUE …
How to Use EXISTS, UNIQUE, DISTINCT, and OVERLAPS in …
If all the values in a result table are UNIQUE, then they’re also DISTINCT from each other. However, unlike the result for the UNIQUE predicate, if the DISTINCT keyword is applied to a …
MySQL DISTINCT - MySQL Tutorial
Summary: in this tutorial, you will learn how to use the MySQL DISTINCT clause in the SELECT statement to eliminate duplicate rows in a result set. Introduction to MySQL DISTINCT clause. …
How to Display Unique Values from a MySQL Database?
Oct 2, 2020 · MySQL DISTINCT helps you find out the distinct or unique values from a table. This is very helpful as it omits the duplicate values from the result-set and returns only the distinct …
Understanding the Difference Between SQL SELECT UNIQUE …
Jan 8, 2024 · Both SELECT UNIQUE and SELECT DISTINCT are used to retrieve unique values from a column that may contain duplicates. The purpose of these statements is to eliminate …
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 …
SQL DISTINCT: The Complete Guide - Database Star
The SQL DISTINCT keyword lets you find unique rows. In this article, you’ll learn how to use it, what it can do, and understand several different examples.
SQL SELECT DISTINCT: Performance Best Practices
Sep 6, 2021 · Before we dive deeper, let’s recall what the SQL SELECT DISTINCT statement is. A database table can include duplicate values for many reasons, but we may want to get the …
SQL SELECT DISTINCT Statement - Scaler Topics
May 4, 2023 · What's the Difference between UNIQUE and DISTINCT in SQL? DISTINCT keyword in SQL eliminates all duplicate records from the result returned by the SQL query. …
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