What are some examples of database constraints?
An example of an AI chatbot conversation about database constraints in databases.
What are some examples of database constraints?
Database constraints are rules that limit the type of data that can be inserted into a table. Examples include primary keys, foreign keys, unique constraints, and check constraints.
Can you explain what a primary key is?
A primary key is a unique identifier for a record in a database table. It ensures that no two rows have the same value in that column.
What about foreign keys?
A foreign key is a field in one table that links to the primary key in another table, establishing a relationship between the two.
What is a unique constraint?
A unique constraint ensures that all values in a column are different from one another, preventing duplicate entries.
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