12 Questions
What is a major issue with traditional file-based systems?
Data redundancy and inconsistency
What is the primary purpose of a super key in a relation schema?
To ensure all attributes are functionally dependent
What is the main difference between a primary key and a candidate key?
A primary key is one of the candidate keys, while a candidate key is any superkey
What is the purpose of a foreign key in a database table?
To establish a relationship with another table
What is a limitation of unique constraints compared to primary keys?
Unique constraints can have NULL values, while primary keys cannot
What is a major advantage of using a database management system over traditional file-based systems?
Improved data security and integrity
What is the primary goal of database normalization?
To reduce data redundancy
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
What is the purpose of an SQL JOIN?
To combine data from multiple tables based on a common field
What is the primary function of an Identity column in SQL?
To automatically generate numeric values
What is the main advantage of using a view in SQL?
To improve data security by limiting access to underlying tables
What is the primary difference between DDL and DML in SQL?
DDL is used for data definition, while DML is used for data manipulation
Learn about the benefits of Database Management Systems over traditional file-based systems and key concepts like super, primary, candidate, and foreign keys. Understand the difficulties of file-processing systems and how DBMS solves them.
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