What are SQL constraints and how do they work?
An example of an AI chatbot conversation about SQL constraints in database management.
What are SQL constraints and how do they work?
SQL constraints are rules applied to columns in a table to ensure data integrity. They define the conditions that data must meet.
Can you give me examples of different types of SQL constraints?
Sure! Common types include NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY, and CHECK constraints.
How does a FOREIGN KEY constraint work?
A FOREIGN KEY constraint links two tables together. It ensures that the value in one table matches a value in another, maintaining referential integrity.
What happens if I try to insert a value that violates a constraint?
If you attempt to insert a value that violates a constraint, the database will reject the operation and return an error.
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