What is the difference between unique and check constraints in SQL?
An example of an AI chatbot conversation about unique and check constraints in SQL.
What is the difference between unique and check constraints in SQL?
Unique constraints ensure that all values in a column are different, while check constraints enforce specific conditions on values.
Can you give me an example of each?
Sure! A unique constraint could be applied to an email column to ensure no two users have the same email. A check constraint might ensure that a column for age only accepts values greater than 0.
Are there any performance implications when using these constraints?
Yes, both constraints can impact performance. Unique constraints may slow down insert operations due to the need to check for duplicates, while check constraints can add overhead during data validation.
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