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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:
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May 20, 2021 · Learn the difference between UNIQUE and DISTINCT in SQL, two keywords that have different roles and uses. UNIQUE is a constraint that prevents duplicate values in a column or set, while DISTINCT is a SELECT option that removes duplicates from the result set.
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Aug 24, 2023 · “Distinct” means total number of different values regardless how many times it appears in the dataset. A name appears in the list multiple times is counted as 1 distinct count. Whereas, the “Unique” value is total number of …
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Aug 9, 2023 · Learn the difference between DISTINCT and UNIQUE in SQL, and how they eliminate duplicates in data sets and columns. DISTINCT works on queries, while UNIQUE is a constraint on tables.
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Nov 20, 2022 · 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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As adjectives the difference between distinct and unique is that distinct is capable of being perceived very clearly while unique is...
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Mar 27, 2024 · This article covers the differences between unique and distinct keywords in SQL, along with some frequently asked questions.
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Apr 22, 2023 · Hi, unique and distinct are not the same. Unique means values that exist only once in the dataset, distinct means values that are repeated several times.
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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 …
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