16 Questions
What is the purpose of the GRANT keyword in MySQL?
To grant privileges to a user
What does the REVOKE keyword do in MySQL?
Revokes permissions from a user
What is a View in MySQL?
A logical representation of data in a database
What is the benefit of using Views in MySQL?
It simplifies complex queries
What is a Trigger in MySQL?
A set of SQL statements that is invoked automatically when a change is made to the data
What does the syntax GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP ON *.* TO 'ahmed'@'localhost'; do?
Grants all privileges to user 'ahmed'
What is the benefit of using Views in terms of data?
It avoids data redundancy
What is the purpose of renaming columns in a View?
To make the query more readable
What is the primary purpose of creating a new user in MySQL?
To provide an additional layer of security
What is the term for the operation a user can perform on a database?
Permission
What is stored in the 'USER' table of the MySQL server?
Login information and account privileges
What is the default status of the ROOT user's password after a MySQL Server installation?
It is not set
What does the 'IDENTIFIED BY' keyword do in the CREATE USER syntax?
Specifies the password
What is the significance of the '@localhost' part in the CREATE USER syntax?
It specifies the host name
Why is it recommended to create a new user in MySQL?
To limit the privileges of the ROOT user
What information does the 'USER' table contain about a MySQL account?
Login information, account privileges, and host information
Study Notes
MySQL User
- A MySQL user is a record in the 'USER' table of the MySQL server, containing login information, privileges, and host information for a MySQL account.
- By default, the ROOT user account has all privileges, but it's recommended to create a new user to give specific privileges.
Creating a New User
- The syntax to create a new user is:
CREATE USER 'username'@'host' IDENTIFIED BY 'password'; -
Useris a keyword. -
usernameis the name of the user. -
hostis the name of the host on which the user is working (e.g., 'localhost' for local computer). -
IDENTIFIED BYis a keyword for password authentication. -
passwordis the password for the user.
Granting Permissions
- Granting permissions means specifying what operations a user can perform on which database.
- The syntax to grant permissions is:
GRANT privileges ON database.* TO 'username'@'host'; -
GRANTis a keyword. -
privilegesare the operations the user is allowed to perform (e.g.,SELECT,INSERT,UPDATE,DELETE,CREATE,DROP). -
database.*specifies the database and tables on which the user has permissions. -
usernameandhostspecify the user and host.
Revoking Permissions
- Revoking permissions means taking away permissions from a user.
- The syntax to revoke permissions is:
REVOKE privileges ON database.* FROM 'username'@'host'; -
REVOKEis a keyword.
Views
- A view is a logical representation of data in a database, allowing programmers to display predetermined data to users.
- Views are masks placed upon tables, enabling the development of a method to display data according to the programmer's desire.
- MySQL creates a temporary table based on the view definition statement and then executes the incoming query on this temporary table.
- Views are created for reasons including:
- Avoiding data duplication
- Simplifying queries
- Allowing querying as a base table itself
- Providing data security
- Avoiding data redundancy
Triggers
- In MySQL, a trigger is a set of SQL statements that is invoked automatically when a change is made to the data on the associated table.
This quiz covers the concepts of Views and user creation in MySQL, including understanding the USER table and account privileges.
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