Загрузка...

UNION vs UNION ALL – Which One Should You Use?

#knowledge360 #akramsohail #akramsohailproject
You Are Hearty Welcomed To My Channel Knowledge 360. Here I post technical videos, mainly related to computer science and programming. I am posting project videos with coding explanations. I make tutorial videos on Technical Topics. Stay Connected, Stay Tuned, and Study Smart.
- Knowledge 360 (Akram Sohail)

Please help me get that beautiful YouTube Silver button. Do subscribe to the channel if my video was helpful. ❤

📌 Subscribe for more tutorials: https://www.youtube.com/@Knowledge360Channel

Best PostgreSQL Tutorial - https://www.youtube.com/playlist?list=PLSU32T6nmU27mdRuIwGSkYxnkCqhmRUhO
Best PostgreSQL Tutorial Shorts - https://www.youtube.com/playlist?list=PLSU32T6nmU25jUQDgZfxPu1cYA0YRAc3P

Learn the key differences between UNION and UNION ALL in PostgreSQL, and when to use each for optimal results in SQL query performance and accuracy.

Follow me on Social Media
--------------------------------------------------
Instagram - https://www.instagram.com/akkubakku007/
WhatsApp - https://wa.me/+919090484904
LinkedIn - https://www.linkedin.com/in/akram-sohail-499489131/
Skype - https://join.skype.com/invite/snliyulHrEBb
Google+ - https://plus.google.com/u/0/116728183002228924227
Blog - https://knowledge360blog.blogspot.in/

Business/Mentorship/Projects - knowledge.360.knowledge@gmail.com
Watch Complete Video - https://youtu.be/ULyuvDFijkE
Blog - https://knowledge360blog.blogspot.com/2025/05/combining-queries-in-postgresql-union.html
Notes - https://drive.google.com/file/d/1mqa79a8ek7VmgYIdlJ2a5uBPdAxda0Ec/view?usp=sharing

Description
🧠 Confused about when to use UNION vs UNION ALL in PostgreSQL? You’re not alone! These two set operators may seem similar, but they serve very different purposes in your SQL queries — and choosing the wrong one can seriously affect your query results and performance.

🎯 In this video, we break down the difference between UNION and UNION ALL with crystal-clear examples using Employees and Departments tables.

🚀 What’s covered:

How UNION removes duplicate rows by default

Why UNION ALL retains all results — duplicates included

Performance implications between the two

Real-world scenarios where each one shines

Best practices to avoid unnecessary sorting and deduplication

Query behavior and output comparison side-by-side

📈 Whether you're building complex reports, cleaning data, or optimizing large queries, knowing when to use UNION or UNION ALL is essential to writing efficient, accurate SQL.

💡 After watching, you'll have no doubts about which operator to use — and why.

📌 Be sure to subscribe, like, and share this with your fellow PostgreSQL learners!

#PostgreSQL #SQL #UnionVsUnionAll #PostgreSQLTutorial #LearnSQL #SQLSetOperators #SQLPerformance #PostgreSQLForBeginners #DataAnalytics #PostgreSQLTips #SQLQueryOptimization

PostgreSQL PostgreSQL Tutorial PostgreSQL Course PostgreSQL Beginner to Advanced PostgreSQL Full Course PostgreSQL Playlist Learn PostgreSQL PostgreSQL for Beginners PostgreSQL Zero to Hero PostgreSQL Training PostgreSQL Complete Guide PostgreSQL Full Tutorial Database Tutorial SQL Tutorial PostgreSQL Explained PostgreSQL Step by Step

Видео UNION vs UNION ALL – Which One Should You Use? канала Knowledge 360
PostgreSQL PostgreSQL Tutorial PostgreSQL Course PostgreSQL Beginner to Advanced PostgreSQL Full Course PostgreSQL Playlist PostgreSQL for Beginners PostgreSQL Zero to Hero PostgreSQL Complete Guide PostgreSQL Full Tutorial UNION vs UNION ALL PostgreSQL UNION ALL PostgreSQL tips PostgreSQL interview prep PostgreSQL advanced queries UNION vs UNION ALL explained PostgreSQL combine queries PostgreSQL full course SQL duplicates union all union vs union all
Комментарии отсутствуют
Зарегистрируйтесь или войдите с
Информация о видео
10 июня 2025 г. 5:30:11
00:00:11
Knowledge 360
Теги
Правообладателям
Жалоба на материал Недопустимый материал Нарушение авторских прав
Комментарии
Поделиться
Другие видео канала

How To Grant Execute On PostgreSQL Function/Procedure To A Role/User || Best PostgreSQL TutorialHow To Grant Execute On PostgreSQL Function/Procedure To A Role/User || Best PostgreSQL Tutorial

How to Use ONLY in SQL Queries: Avoiding Unwanted Data!How to Use ONLY in SQL Queries: Avoiding Unwanted Data!

ALTER TABLE To Add Foreign Key Constraint To PostgreSQL Table || Best PostgreSQL Tutorial ShortsALTER TABLE To Add Foreign Key Constraint To PostgreSQL Table || Best PostgreSQL Tutorial Shorts

Speed Up PostgreSQL Inserts With Bulk Insert Techniques || Best PostgreSQL Tutorial ShortsSpeed Up PostgreSQL Inserts With Bulk Insert Techniques || Best PostgreSQL Tutorial Shorts

Deleting Data and Returning Rows in PostgreSQLDeleting Data and Returning Rows in PostgreSQL

Use CUBE in PostgreSQL for Financial BudgetingUse CUBE in PostgreSQL for Financial Budgeting

How To Insert/Select Data From List Partitioning In PostgreSQL || Best PostgreSQL Tutorial ShortsHow To Insert/Select Data From List Partitioning In PostgreSQL || Best PostgreSQL Tutorial Shorts

How To Apply Simple Group BY Examples In PostgreSQLHow To Apply Simple Group BY Examples In PostgreSQL

Self Referential Foreign Key In PostgreSQL || Best PostgreSQL Tutorial ShortsSelf Referential Foreign Key In PostgreSQL || Best PostgreSQL Tutorial Shorts

How To Set Search Path to Public In PostgreSQL || Best PostgreSQL Tutorial ShortsHow To Set Search Path to Public In PostgreSQL || Best PostgreSQL Tutorial Shorts

Writing Subqueries in SELECT ListWriting Subqueries in SELECT List

Ranking in PostgreSQL: RANK(), ROW_NUMBER(), DENSE_RANK()Ranking in PostgreSQL: RANK(), ROW_NUMBER(), DENSE_RANK()

How To Fetch Data From List Partitioning In PostgreSQL || Best PostgreSQL Tutorial ShortsHow To Fetch Data From List Partitioning In PostgreSQL || Best PostgreSQL Tutorial Shorts

Data Types In PostgreSQL: Character Data Types || PostgreSQL Full Playlist Video #45Data Types In PostgreSQL: Character Data Types || PostgreSQL Full Playlist Video #45

How To Fetch Data From Range Partitioning In PostgreSQL || Best PostgreSQL Tutorial ShortsHow To Fetch Data From Range Partitioning In PostgreSQL || Best PostgreSQL Tutorial Shorts

How To Include The Schema In User Role Search Path In PostgreSQL || Best PostgreSQL Tutorial ShortsHow To Include The Schema In User Role Search Path In PostgreSQL || Best PostgreSQL Tutorial Shorts

What Is Row Level Security Delete Policy In PostgreSQL || Best PostgreSQL Tutorial ShortsWhat Is Row Level Security Delete Policy In PostgreSQL || Best PostgreSQL Tutorial Shorts

ALTER TABLE To Add A New Column With Default Value In PostgreSQL || Best PostgreSQL Tutorial ShortsALTER TABLE To Add A New Column With Default Value In PostgreSQL || Best PostgreSQL Tutorial Shorts

How To Insert/Select Data From Hash Partitioning In PostgreSQL || Best PostgreSQL Tutorial ShortsHow To Insert/Select Data From Hash Partitioning In PostgreSQL || Best PostgreSQL Tutorial Shorts

What Is A Default Value In PostgreSQL Table Columns || Best PostgreSQL Tutorial ShortsWhat Is A Default Value In PostgreSQL Table Columns || Best PostgreSQL Tutorial Shorts

Яндекс.Метрика
© 2008-2026 «Информационно-развлекательный портал города Верхняя Салда»
salda.ws@mail.ru salda_ws Контакты Карта портала Сообщить об ошибке Соглашения Пользовательское соглашение Соглашение о конфиденциальности Согласие на обработку персональных данных Информация для правообладателей Об использовании Cookies
Все заметки Новая заметка Страницу в заметки
Страницу в закладки Мои закладки
На информационно-развлекательном портале SALDA.WS применяются cookie-файлы. Нажимая кнопку Принять, вы подтверждаете свое согласие на их использование.
О CookiesНапомнить позжеПринять