Which data validation technique prevents invalid data from being entered into the database by checking it against predefined rules?
Data Scrubbing
Data Masking
Data Transformation
Check Constraints
What is the primary purpose of a Primary Key in a database table?
To define the order in which data is stored.
To ensure that all columns in the table have a value.
To uniquely identify each row within the table.
To establish a relationship with another table.
Why is defining a clear and well-structured schema important in database design?
It eliminates the need for using SQL queries.
It automates the process of data entry.
It simplifies data management, improves data integrity, and enhances query efficiency.
It makes the database look visually appealing.
Which type of dependency does Third Normal Form (3NF) aim to eliminate?
Transitive dependency
Partial dependency
Join dependency
Multi-valued dependency
What element in an ER diagram describes the properties or characteristics of an entity?
Relationship
Cardinality
Attribute
Entity
When converting an ER diagram to a database schema, what does an entity typically become?
A row
A database
A table
A column
What is the role of a column in a database table?
To define a row in the table.
To link the table to another table.
To store the entire dataset of the table.
To represent a specific attribute or characteristic of an entity.
Which of these is crucial to consider when choosing data types for columns?
The kind of data the column will store and its expected size.
The type of storage device used by the database server.
The username of the person creating the table.
The color scheme of the user interface.
In a normalized database, what is the typical relationship between tables?
Tables are completely independent
Tables are connected through foreign keys
Tables are organized alphabetically
One table contains all the data, while others are empty
What is the primary benefit of using cascading actions in database design?
Reduced storage space
Simplified data manipulation
Improved query performance
Enhanced security