Querying document databases

Using Postgres JSON to query document data is similar to querying relational data with Postgres. In this exercise, you'll practice building a query to retrieve document data from the nested_reviews table, with Postgres JSON. Happy querying!

Cet exercice fait partie du cours

Introduction to NoSQL

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Instructions

Update the query to return the review column from the nested_reviews table.
Use the appropriate pandas function to create a DataFrame using the logic stored in the query variable.
Output the first record in the DataFrame returned after executing the query.

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

# Update the query to select the review field
query = """
	SELECT 
    	____
    FROM nested_reviews;
"""

# Execute the query
data = ____.____(query, db_engine)

# Print the first element of the DataFrame
____(data.iloc[0, 0])

Modifier et exécuter le code