What are some examples of check constraints in SQL?
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What are some examples of check constraints in SQL?
Check constraints are rules that limit the values that can be placed in a column. For example, you can use a check constraint to ensure that a column only contains positive numbers.
Can you give me a specific SQL example?
Sure! Here's an example: CREATE TABLE Employees (ID int, Age int CHECK (Age >= 18)); This ensures that the Age must be 18 or older.
What happens if I try to insert a value that violates the check constraint?
If you try to insert a value that violates the check constraint, the database will reject the insertion and return an error.
Are there any other types of constraints in SQL?
Yes, besides check constraints, there are primary key constraints, foreign key constraints, and unique constraints, among others.
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