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 PRIMARY KEY, FOREIGN KEY, UNIQUE, NOT NULL, 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?
The FOREIGN KEY constraint is used to link 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 the CHECK constraint?
Yes! The CHECK constraint allows you to specify a condition that must be met for values in a column. For example, you can ensure that a column for age only accepts values greater than 0.
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