What data formats are commonly used in document databases?
CSV and TXT
HTML and CSS
JSON and XML
DOC and PDF
CSV and TXT
HTML and CSS
JSON and XML
DOC and PDF
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How does a document database store data?
In rows and columns
In word documents
In spreadsheets
In flexible documents
In rows and columns
In word documents
In spreadsheets
In flexible documents
Explanation
What can the value in a key-value pair be?
Only dates
Only numbers
Correct Answer:
Any type of data
Only words
Only dates
Only numbers
Correct Answer:
Any type of data
Only words
Explanation
What does a key in a key-value database represent?
A type of data
Correct Answer:
A unique identifier
A column
A table
A type of data
Correct Answer:
A unique identifier
A column
A table
Explanation
What is non-structured data?
Data that is always numerical
Data that fits neatly into rows and columns
Correct Answer:
Data that doesn't have a clear order or pattern
Data that is always textual
Data that is always numerical
Data that fits neatly into rows and columns
Correct Answer:
Data that doesn't have a clear order or pattern
Data that is always textual
Explanation
What does a relationship in a database do?
Connects two entities
Stores data
Deletes data
Creates a new database
Connects two entities
Stores data
Deletes data
Creates a new database
Explanation
Which type of data is best stored in a relational database?
Random data
Structured data
Semi-structured data
Non-structured data
Random data
Structured data
Semi-structured data
Non-structured data
Explanation
What is the purpose of forms in a database?
To reduce data entry errors
To create new tables
To change database settings
To delete records
To reduce data entry errors
To create new tables
To change database settings
To delete records
Explanation
What is the purpose of data modeling?
To help programmers and others understand the complex flow of data within an organization
To create new programming languages
To manage network security
To design hardware components
To help programmers and others understand the complex flow of data within an organization
To create new programming languages
To manage network security
To design hardware components
Explanation
What is a database schema?
A type of data storage device
A programming language
A type of software
The architecture of how a database is structured and organized
A type of data storage device
A programming language
A type of software
The architecture of how a database is structured and organized
Explanation
What is a primary key in a database?
A type of data that can be left blank
A value that can change over time
Correct Answer:
A unique identifier for each record
A common name shared by multiple records
A type of data that can be left blank
A value that can change over time
Correct Answer:
A unique identifier for each record
A common name shared by multiple records
Explanation
What is a foreign key?
A primary key from another table
A key that is used to unlock a database
A key that can be left blank
A key that is always the same as the primary key
A primary key from another table
A key that is used to unlock a database
A key that can be left blank
A key that is always the same as the primary key
Explanation
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NoSQL stands for "Not Only SQL." It refers to a class of database management systems that are designed to handle unstructured or semi-structured data and can scale easily with large datasets. NoSQL databases do not rely solely on the traditional relational database structure, which uses tables and rows, but can support various data models such as document, key-value, graph, and columnar formats. This makes them ideal for handling big data, real-time web applications, and distributed architectures.
A relational database is a database that keeps data in several connected tables. These tables are structured with rows and columns, and they use relationships (often through keys, such as primary keys and foreign keys) to connect data across different tables. This structure allows for efficient organization, retrieval, and manipulation of data, and it supports complex queries involving multiple tables
A foreign key is a primary key from another table. It is a column or set of columns in a relational database table that creates a link between data in two tables. The foreign key in one table refers to the primary key in another table, establishing a relationship between the tables and enforcing referential integrity. This ensures that the data in the foreign key column must match a value in the related table's primary key.
In document databases, the commonly used data formats are JSON and XML. These formats allow for flexible and semi-structured data storage, making them ideal for handling complex, hierarchical data structures. Document databases, like MongoDB and CouchDB, often store and retrieve data in these formats due to their compatibility with web applications and ease of parsing.
A document database stores data in flexible documents. These documents are typically in formats like JSON, BSON, or XML, and can hold complex, nested data structures. Unlike relational databases that use rows and columns, document databases store data as key-value pairs within documents, allowing each document to have a unique structure. This flexibility makes document databases suitable for handling unstructured or semi-structured data.