Use the Check Constraints dialog to define check constraints for a table or to view a check constraint that is currently defined for a table. You can add a new constraint, view a constraint definition, or remove a constraint. You cannot, however, change the constraint definition once the constraint is created. If you want to change a check constraint, you must first delete the constraint and then recreate it.
Constraint name
The SQL name for the constraint.Table schema
The schema where the table for the constraint resides.Table name
The name of the table that the constraint is build upon.
You can build an expression for your check constraint using Check condition. For details, see Check condition.
Once you have defined your check constraint, click OK. The constraint is not created until you click OK on the Table dialog.