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Questions and Answers
What is the purpose of the CREATE USER command in a system?
What is the purpose of the CREATE USER command in a system?
The CREATE USER command is used to create a new user in the system with a specified username and password.
Explain the function of the GRANT command.
Explain the function of the GRANT command.
The GRANT command assigns specific access rights such as SELECT, INSERT, UPDATE, or DELETE to a user for a designated table.
What distinguishes an administrator from a regular user in terms of permissions?
What distinguishes an administrator from a regular user in terms of permissions?
An administrator has all permissions within the system, including the ability to create users, while regular users have limited permissions.
How can you revoke a user's permissions, and which command is used?
How can you revoke a user's permissions, and which command is used?
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What is meant by roles in the context of user management in a system?
What is meant by roles in the context of user management in a system?
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Study Notes
User Roles and Permissions
- Users are created in systems for different access levels
- Standard systems have more than one user
- User creation commands are used to add users
-
CREATE USER user PASSWORD 'password'is a command to create a user with a password -
useris the username -
passwordis the user's password - Example:
CREATE USER vardenis PASSWORD 'nevardenis'
User Permissions
- Users are given permissions based on their needs.
- Standard systems have different user types (e.g., basic vs. administrator)
- Command
GRANT SELECT [, INSERT, UPDATE, DELETE] ON TABLE_NAME TO usergrants permissions -
SELECT,INSERT,UPDATE,DELETEare permission types - Example:
GRANT SELECT, DELETE ON darbuotojai TO vardenisgrants select and delete permissions on the 'darbuotojai' table to the 'vardenis' user
Advanced Permissions
- To alter table structures, special commands are needed
- Other permission commands like
GRANT ALTER ANY SCHEMA TO userprovide advanced permissions -
ALTERgives editing permissions -
REVOKE ALTER ANY SCHEMA FROM userrevokes advanced permissions
Administrator Permissions
- Administrators have all permissions (and add user creation permissions)
- Administrator commands include
ALTER USER user ADMIN true - These are usually not given to all users due to security concerns
User Roles
- A role is a user type.
- New users receive appropriate permissions.
- Using roles avoids needing separate grant statements for each user
- Roles are created using
CREATE ROLE ROLE_NAME - Role assignment uses
GRANT ROLE_NAME TO user -
ROLE_NAMEis the role
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Description
This quiz covers the key concepts related to user roles and permissions in database systems. You will learn about user creation commands, different types of user permissions, and advanced permission commands. Gear up to test your understanding of managing user access and security in databases.
