What are some examples of SQL constraints?
An example of an AI chatbot conversation about SQL constraints and their usage in databases.
What are some examples of SQL constraints?
SQL constraints are rules applied to columns in a table to enforce data integrity. Examples include NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY, and CHECK.
Can you explain the PRIMARY KEY constraint?
The PRIMARY KEY constraint uniquely identifies each record in a table. It must contain unique values and cannot contain NULL.
What about the FOREIGN KEY constraint?
A FOREIGN KEY constraint links two tables together. It ensures that the value in one table matches a value in another, maintaining referential integrity.
Are there any examples of using CHECK constraints?
Yes! A CHECK constraint can enforce a condition on a column, like ensuring that a 'salary' column only contains values greater than 0.
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