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DBMS Advantages and Key Concepts

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Questions and Answers

What is a major issue with traditional file-based systems?

Data encryption
Data redundancy and inconsistency (correct)
Data normalization
Atomicity of updates

What is the primary purpose of a super key in a relation schema?

To ensure all attributes are functionally dependent (correct)
To provide a minimal subset of attributes
To ensure data normalization
To uniquely identify a row

What is the main difference between a primary key and a candidate key?

A primary key is used for indexing, while a candidate key is used for querying
A primary key is a minimal superkey, while a candidate key is not
A primary key is one of the candidate keys, while a candidate key is any superkey (correct)
A primary key can have NULL values, while a candidate key cannot

What is the purpose of a foreign key in a database table?

To establish a relationship with another table (C) Signup and view all the answers

What is a limitation of unique constraints compared to primary keys?

Unique constraints can have NULL values, while primary keys cannot (D) Signup and view all the answers

What is a major advantage of using a database management system over traditional file-based systems?

Improved data security and integrity (D) Signup and view all the answers

What is the primary goal of database normalization?

To reduce data redundancy (B) Signup and view all the answers

What is the main difference between the HAVING and WHERE clauses in SQL?

HAVING is used for filtering groups, while WHERE is used for filtering individual rows (A) Signup and view all the answers

What is the purpose of an SQL JOIN?

To combine data from multiple tables based on a common field (A) Signup and view all the answers

What is the primary function of an Identity column in SQL?

To automatically generate numeric values (C) Signup and view all the answers

What is the main advantage of using a view in SQL?

To improve data security by limiting access to underlying tables (D) Signup and view all the answers

What is the primary difference between DDL and DML in SQL?

DDL is used for data definition, while DML is used for data manipulation (D) Signup and view all the answers