Oracle delete user

I have such table:

users:
id PK
.
.
.

workers:
id PK
user_id (FK to users)
.
.
.

evaluations:
id PK
worker_id (FK to workers)
.
.
.

And now I want to delete user. When I delete user then worker also should be delet开发者_运维技巧ed. How can I do this?

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You have 2 options:

1. Create 3 delete-statements,
2. Create a cascading delete constraint.