Return Matched and Unmatched Records with Intersect and Except Operator in SQL Server
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- Опубликовано: 6 сен 2024
- One of the most common data analysis tasks I have seen is trying to figure out matched and unmatched records from 2 tables. So in this SQL Server tutorial, we will learn how to use INTERSECT and EXCEPT operators to perform such task.
📖 More information on INTERSECT and EXCEPT: docs.microsoft...
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Can you use EXCEPT to pick up on data variance within the columns if you have say 20 columns
You can, but then you will have to manually specify the conditions, which is a lot of typing.
@@jiejenn great..thank you!
Is using INTERSECT and EXCEPT more efficient than using EXISTS and NOT EXISTS ?
Performance wise, I think INTERSECT and EXCEPT to be more efficient as the operation is doing a straight comparison between two tables vs EXISTS evaluates each records. But the biggest difference is INTERSECT and EXCEPT will eliminate duplicate records and EXISTS don't.
@@jiejenn Thanks for the clarification. I think using DISTINCT would alleviate duplicate records; however, INTERCEPT and EXCEPT are more straightforward to code.
Database automation by using python