What is the purpose of constraint naming

Question

What is the purpose of naming your constraints (unique, primary key, foreign key)?

Say I have a table which is using natural keys as a primary key:

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Answer 1

To identify the constraint in the future (e.g. you want to drop it in the future), it should have a unique name. If you don't specify a name for it, the database engine will probably assign a weird name (e.g. containing random stuff to ensure uniqueness) for you.