Learn Database with ARJ

What is a database?

• A database is a programming language used for data analysis.

• A database is a type of software for creating websites.

• A database is a physical location for storing files.

• A database is an organized collection of data stored electronically.

Define data and information.

• Data is raw facts; information is processed data that has meaning.

• Data is a summary of findings; information is the collection of data.

• Data is always organized; information is unstructured.

• Data is only numerical; information is only textual.

What is a field in a database?

• A field is a column in a database table that stores specific data attributes.

• A field is a command used to query a database.

• A field is a row in a database table.

• A field is a type of database software.

What is a record in a database?

• A record is a command used to query a database.

• A record is a collection of related data items stored together in a database.

• A record is a type of database software.

• A record is a single data type in a database.

What are primary keys?

• Primary keys can be duplicated across records.

• Primary keys are unique identifiers for records in a database table.

• Primary keys are used to store large text data.

• Primary keys are optional fields in a database table.

What are foreign keys?

• Foreign keys are used to create indexes on a single table.

• Foreign keys are a type of primary key that can exist independently.

• Foreign keys are constraints that link records in one table to records in another table, ensuring data integrity.

• Foreign keys are constraints that only apply to the primary table.

What are the different types of databases?

• Relational, NoSQL, In-memory, Time-series

• Distributed, Hierarchical, Document

• Cloud, XML, CSV

• Flat-file, Graph, Object-oriented

What does SQL stand for?

• Structured Query Language

• Standard Query Language

• Structured Query List

• Simple Query Language

What is the purpose of sorting in a database?

• To encrypt sensitive information in the database.

• To delete unnecessary data from the database.

• The purpose of sorting in a database is to organize data in a specific order for efficient retrieval and analysis.

• To create backups of the database.

What is indexing in a database?

• Indexing is a technique to optimize data retrieval in a database by creating a data structure that allows faster access to records.

• Indexing refers to the process of backing up data in a database.

• Indexing is a technique to encrypt data in a database.

• Indexing is a method to delete records from a database.