What are set operations in database queries?
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What are set operations in database queries?
Set operations in database queries allow you to combine results from two or more queries. The main types are UNION, INTERSECT, and EXCEPT.
Can you explain how the UNION operation works?
Sure! The UNION operation combines the results of two queries and removes duplicates. For example, if you have two tables with similar columns, UNION will return all unique rows from both.
What about the INTERSECT operation?
INTERSECT returns only the rows that are present in both queries. It's useful when you want to find common records between two datasets.
Are there any limitations to using these operations?
Yes, all queries involved in set operations must have the same number of columns and compatible data types.
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