Extracting and Analyzing Data from JSON Columns in SQL

Many modern applications store semi-structured data within relational databases, often using JSON columns. This challenge focuses on utilizing SQL's JSON functions to extract specific values from JSON data stored in a table and perform basic analysis. Successfully completing this challenge demonstrates proficiency in querying and manipulating JSON data within a SQL environment, a crucial skill for working with contemporary data storage solutions.

Problem Description

You are given a table named product_data containing product information. Each product has a product_id (integer) and a details column which stores a JSON string containing various product attributes like name, price, category, and features. The features attribute itself is a JSON array of strings.

Your task is to write SQL queries to:

1. Extract the name of each product.
2. Extract the price of each product and calculate the average price across all products.
3. For each product, extract the first feature from the features array.
4. Find the products belonging to the 'Electronics' category.
5. Calculate the number of products with a price greater than 100.

Key Requirements:

• Use appropriate JSON functions provided by your SQL dialect (e.g., JSON_EXTRACT, JSON_VALUE, ->>, ->, etc.). The specific functions will depend on the database system you are using (PostgreSQL, MySQL, SQL Server, etc.).
• Handle potential errors gracefully. If a product's details column is malformed or missing a specific attribute, the query should not fail but should return a sensible default value (e.g., NULL).
• Ensure the queries are efficient and performant, especially when dealing with a large number of rows.

Expected Behavior:

The queries should return the requested data accurately and efficiently. The average price calculation should be precise. The category filtering should correctly identify products belonging to the 'Electronics' category. The count of products with a price greater than 100 should be accurate.

Edge Cases to Consider:

• details column is NULL.
• details column contains invalid JSON.
• features array is empty or missing.
• price is NULL or not a valid number.
• category is NULL or missing.

Examples

Example 1:

Input:
product_data table:
product_id | details
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