What is the purpose of a CHECK constraint in a relational database?
- Checks the existence of indexes on specified columns
- Enforces rules on the values allowed in a column or columns
- Validates the syntax of SQL statements
- Verifies the referential integrity of the database
A CHECK constraint in a relational database enforces rules on the values allowed in a column or columns. It ensures that data entered into the database meets specified criteria, providing a mechanism for controlling and restricting the range of acceptable values.
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