Unique Fields Combination

This trigger validates that a certain combination of fields is unique across all records. If the combination is not unique (another record contains the same values for each of the fields specified here), the operation is terminated and an error message is displayed. To use this trigger, select:

• A combination of fields that must be unique
• The error message to display (e.g., "Author and title combination must be unique")
• Option to ignore fields' combination with null values.