Setting Check Properties

Use the Check Name edit box to set the check name.

Check Expression
Type in the definition for the check constraint. That is, set the condition for checking, e.g. "field_name1 > 0 AND field_name2 > field_name1" in the Check Expression edit box. A check constraint specified as a column constraint should reference that column's value only, while an expression appearing in a table constraint may reference multiple columns.

Enable
You can choose whether to enable / disable the check constraint by checking / unchecking the box.