Extracting Nested JSON Objects with JSON_QUERY

Use JSON_QUERY to Extract Nested Objects

Write a SQL query to extract nested objects from a JSON column.

Solution:

-- Extract nested objects from a JSON column.
SELECT 
    EmployeeID,
    Name,
    JSON_QUERY(Profile, '$.Address') AS AddressDetails
FROM Employees;

Explanation:

1. Purpose of the Query :

1. The goal is to demonstrate how to use JSON_QUERY to extract nested JSON objects (e.g., an employee's address) from a JSON column (Profile).

2. Key Components :

1. JSON_QUERY(Profile, '$.Address') : Extracts the nested JSON object for the Address field.
2. $.Address : Specifies the path to the nested object.

3. Why use JSON_QUERY? :

1. JSON_QUERY is ideal for extracting complex structures like arrays or objects from JSON data.

4. Real-World Application :

1. For example, in user profile systems, you might use this query to retrieve detailed address information stored as a nested JSON object.

Additional Notes:

• Ensure that the JSON structure contains valid nested objects.
• Use this exercise to teach how to handle deeply nested JSON data.

For more Practice: Solve these Related Problems:

• Write a SQL query to extract the contact information object from a JSON column storing user profiles.
• Write a SQL query to retrieve the education history array from a nested JSON object in a resume database.
• Write a SQL query to extract all metadata fields from a JSON column representing document properties.
• Write a SQL query to parse and display nested configuration settings stored in a JSON format.

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