UNION vs UNION ALL in SQL Server: Key Differences & Examples
UNION vs UNION ALL in SQL Server: Key Differences & Examples
In this video, we'll explore the differences between UNION and UNION ALL in SQL Server. We'll cover:
What is UNION and UNION ALL?
How they differ in removing duplicate rows
Examples of using UNION vs UNION ALL
Execution plan differences and performance implications
Tips for using UNION and UNION ALL effectively
By the end of this video, you'll have a solid understanding of when to use UNION vs UNION ALL in your SQL Server queries.
Timestamp:
0:00 - Introduction
0:26 - Real Life Example
1:12 - Union vs Union All
1:33 - Example of Union
4:47 - Example of Union All
5:46 - Execution Plan for Union
6:18 - Execution Plan for Union All
6:52 - Column Mapping with Union
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#sqlserver #union #unionall #sql #sqltips #sqltutorial #sqlinterviewquestions #sqltraining
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