Podcast
Questions and Answers
What does NoSQL stand for?
What does NoSQL stand for?
- Not only SQL (correct)
- No structured SQL
- Non-optimized SQL
- Not organized SQL
Which of the following is a characteristic of NoSQL databases?
Which of the following is a characteristic of NoSQL databases?
- Requires complex SQL queries
- Enforces a strict schema
- Relies solely on tables for data organization
- Allows for wide variety of data to be stored (correct)
Which type of NoSQL database stores data in key-value pairs?
Which type of NoSQL database stores data in key-value pairs?
- Document database
- Key-value database (correct)
- Graph database
- Column-oriented database
What is a primary use case for document databases?
What is a primary use case for document databases?
How do column-oriented databases differ from traditional relational databases?
How do column-oriented databases differ from traditional relational databases?
Which of the following best describes graph databases?
Which of the following best describes graph databases?
What type of data can NoSQL databases manage?
What type of data can NoSQL databases manage?
In what way does NoSQL improve performance compared to traditional databases?
In what way does NoSQL improve performance compared to traditional databases?
What do nodes represent in a NoSQL data model?
What do nodes represent in a NoSQL data model?
What does a column-oriented database allow for?
What does a column-oriented database allow for?
Which of the following can be a use case for NoSQL databases?
Which of the following can be a use case for NoSQL databases?
What type of SQL structure is used when querying a column-oriented database?
What type of SQL structure is used when querying a column-oriented database?
Which of the following benefits is associated with column-oriented databases?
Which of the following benefits is associated with column-oriented databases?
Which statement best describes data retrieval in a column-oriented database?
Which statement best describes data retrieval in a column-oriented database?
What is a key component when executing queries in a Snowflake database?
What is a key component when executing queries in a Snowflake database?
What is the purpose of the fetch_pandas_all()
function in the Snowflake query execution?
What is the purpose of the fetch_pandas_all()
function in the Snowflake query execution?
What format do document databases use to store data?
What format do document databases use to store data?
Which Python package is used to create the connection to a Postgres database?
Which Python package is used to create the connection to a Postgres database?
What is the primary purpose of the pd.read_sql() function?
What is the primary purpose of the pd.read_sql() function?
In the provided SQL query example, which attribute is being filtered in the WHERE clause?
In the provided SQL query example, which attribute is being filtered in the WHERE clause?
What type of NoSQL data store uses key-value pairs for data storage?
What type of NoSQL data store uses key-value pairs for data storage?
Which of the following is NOT a part of the connection creation process for a Postgres database?
Which of the following is NOT a part of the connection creation process for a Postgres database?
What is the output of the provided SQL query example expected to return?
What is the output of the provided SQL query example expected to return?
In a graph database, what does the structure primarily consist of?
In a graph database, what does the structure primarily consist of?
Flashcards
NoSQL
NoSQL
A family of non-relational database systems that store and retrieve data in ways that differ from traditional relational databases (SQL).
Relational Database
Relational Database
A database that stores data in tables with rows and columns, using SQL for queries.
NoSQL Data Stores
NoSQL Data Stores
These databases store data in various formats (tabular, key-value, document, graph) offering different strengths for specialized needs.
Column-oriented Database
Column-oriented Database
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Document Database
Document Database
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Key-Value Store
Key-Value Store
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Graph Database
Graph Database
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High-Frequency Data
High-Frequency Data
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Graph Database
Graph Database
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Column-oriented Database
Column-oriented Database
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Column-Oriented Query Execution
Column-Oriented Query Execution
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SQL-like Syntax
SQL-like Syntax
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Snowflake Database Connection
Snowflake Database Connection
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Snowflake Query Execution
Snowflake Query Execution
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Document Databases
Document Databases
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JSON Data Query (Postgres)
JSON Data Query (Postgres)
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Connection String (Postgres)
Connection String (Postgres)
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SQLAlchemy Engine
SQLAlchemy Engine
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Postgres JSON Queries in Python
Postgres JSON Queries in Python
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Key-Value Data Store
Key-Value Data Store
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Graph Data Store
Graph Data Store
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Study Notes
Introduction to NoSQL
- NoSQL stands for "not only SQL"
- It's a set of data storage tools and techniques
- It supports structured, semi-structured, and unstructured data
- It allows for storage and retrieval of varied data types
Traditional Relational Databases (RDBMS)
- Organize data in tables with rows and columns
- Use SQL to manage and query data
- Databases and tables use constraints to enforce data integrity
NoSQL Data Stores
-
Tabular: Stores data in columns and rows
-
Column-oriented: Stores data in columns, fast querying, and easier schema changes
- Uses SQL-like syntax
- Selective reads/retrieval
- Automatic data clustering
- Suitable for big data and analytics workflows
-
Document: Stores semi-structured data in JSON format
- Less rigid schema
- Suitable for user generated data and real-time analytics
-
Key-value: Stores data as key-value pairs
- Simple data written and read frequently
- Suitable for IoT data and mobile applications
-
Graph: Stores data in a network of nodes and edges
- Nodes represent entities, edges represent relationships
- Suitable for social networks
Connecting to a Snowflake Database
snowflake.connector.connect()
is used to connect- Requires
user
,password
,account_identifier
,database
,schema
, andwarehouse
names
Writing and Executing Snowflake Queries
- Build queries in strings/multiline strings
- Use
conn.cursor().execute(query).fetch_pandas_all()
to execute and fetch results as a DataFrame - Print the
results
Non-tabular NoSQL Data Stores
-
Document Databases: Stores data in a flexible, semi-structured format (like JSON)
- Supports key-value, key-array, and key-object pairs
-
Querying JSON Data with PostgreSQL JSON
- Use SQL-like syntax to query JSON data.
->
extracts JSON values->>
for string extraction within JSON.
-
Connecting to a Postgres Database
-
Import
sqlalchemy
:import sqlalchemy
-
Creates a connection string using
postgresql+psycopg2://<user>:<password>@<host>:<port>/<database>
-
Use
sqlalchemy.create_engine()
to create a database engine. -
Writing and Executing Postgres JSON Queries
- Construct query statements.
- Pass the query and
db_engine
topd.read_sql()
to execute the query - Store the result in a pandas DataFrame
Other Non-tabular NoSQL Stores
- Key-value: Stores data in key-value pairs
- Graph: Stores data in a network of nodes and edges
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Description
This quiz covers the basics of NoSQL databases, distinguishing them from traditional relational databases. Explore various types of NoSQL data stores, including tabular, column-oriented, document, and key-value databases, along with their benefits and use cases.