Final answer:
Constraint names are used to identify and manage constraints in a database management system. They must be unique and are case-sensitive.
Step-by-step explanation:
Constraint names are used in database management systems to uniquely identify and manage constraints. Option A is true because a constraint name can be used by a database administrator (DBA) to easily identify a specific constraint in the database schema. Option B is false because two constraints cannot have the same name, even if they are located in different tables. Each constraint must have a unique name. Option C is false because constraint names are not required to be unique across all constraints in a database. Option D is true, constraint names are case-sensitive, so 'Constraint1' would be different from 'constraint1'.