What are the best practices for SQL constraints?
An example of an AI chatbot conversation about SQL constraints best practices.
What are the best practices for SQL constraints?
Best practices for SQL constraints include using primary keys, foreign keys, and unique constraints to ensure data integrity.
Can you explain the difference between primary keys and unique constraints?
Sure! A primary key uniquely identifies each record in a table and cannot be null, while a unique constraint ensures all values in a column are distinct but can allow nulls.
When should I use foreign keys?
Use foreign keys to establish relationships between tables, ensuring referential integrity by linking records in one table to records in another.
What happens if I violate a constraint?
If you violate a constraint, the database will reject the operation and return an error, preventing invalid data from being entered.
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