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Questions and Answers
What does NoSQL stand for?
What does NoSQL stand for?
Which of the following is a characteristic of NoSQL databases?
Which of the following is a characteristic of NoSQL databases?
Which type of NoSQL database stores data in key-value pairs?
Which type of NoSQL database stores data in key-value pairs?
What is a primary use case for document databases?
What is a primary use case for document databases?
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How do column-oriented databases differ from traditional relational databases?
How do column-oriented databases differ from traditional relational databases?
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Which of the following best describes graph databases?
Which of the following best describes graph databases?
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What type of data can NoSQL databases manage?
What type of data can NoSQL databases manage?
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In what way does NoSQL improve performance compared to traditional databases?
In what way does NoSQL improve performance compared to traditional databases?
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What do nodes represent in a NoSQL data model?
What do nodes represent in a NoSQL data model?
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What does a column-oriented database allow for?
What does a column-oriented database allow for?
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Which of the following can be a use case for NoSQL databases?
Which of the following can be a use case for NoSQL databases?
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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?
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Which of the following benefits is associated with column-oriented databases?
Which of the following benefits is associated with column-oriented databases?
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Which statement best describes data retrieval in a column-oriented database?
Which statement best describes data retrieval in a column-oriented database?
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What is a key component when executing queries in a Snowflake database?
What is a key component when executing queries in a Snowflake database?
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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?
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What format do document databases use to store data?
What format do document databases use to store data?
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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?
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What is the primary purpose of the pd.read_sql() function?
What is the primary purpose of the pd.read_sql() function?
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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?
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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?
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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?
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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?
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In a graph database, what does the structure primarily consist of?
In a graph database, what does the structure primarily consist of?
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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, andwarehousenames
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_enginetopd.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.
