In an employee database, a table called 'employees' has a 'salary' field. The company policy states that no employee should have a salary lower than $30,000. Which type of constraint would be used to ensure this policy is enforced?
FOREIGN KEY constraint
PRIMARY KEY constraint
CHECK constraint
UNIQUE constraint
A CHECK constraint is used to limit the range of values that can be placed in a column. If you try to insert a salary value of less than $30,000, the database will return an error because of the CHECK constraint. PRIMARY KEY constraints are used to uniquely identify each row in a table. UNIQUE constraints prevent duplicate values in a single column or combination of columns. FOREIGN KEY constraints are used to link two tables together.
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