Database Fundamentals #33: Check Constraints from the GUI
The other types of constraints are referred to as check constraints. They limit the data by defining a logical operation that checks the state of the data prior to allowing an insert or update to the table. The logical operation is not against other tables. The logic can be against multiple columns in the same table. Let’s start with a simple example. The business has determined that the transactions it’s recording will never be less than $10. As part of the business definition, they would like a constraint put in place that limits the TransactionAmount values in the Finance.FinancialTransaction table to only accept values that are greater than $10. Let’s create this constraint using the GUI and again, in the next post, using T-SQL. Check Constraint with the GUI We’ll…