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In today's data-driven world, JSON has become an integral part of the language of the web. It is used for storing and exchanging data between servers and clients. MySQL Shell, a command-line interface for MySQL Server, provides support for JavaScript Object Notation (JSON) documents through the X DevAPI. This feature allows developers to manipulate JSON documents stored in MySQL databases using SQL and CRUD operations, making it a powerful tool for querying, updating, and managing JSON data.

To begin with, it is important to note that MySQL 8.0 supports JSON data types, which enables efficient access to data in JSON documents. When you store JSON in MySQL, the server automatically validates the JSON documents and rejects invalid ones. Here's an example of how to insert a JSON document into a MySQL table:

INSERT INTO table_name (json_column) VALUES ('{"key": "value"}');

With MySQL Shell, you can execute queries against JSON documents using SQL and the X DevAPI. The X DevAPI provides a fluent API for working with JSON documents. Here's an example of how to query a JSON document using SQL:

SELECT json_column->'$.key' FROM table_name WHERE json_column->'$.key' = 'value';

Microsoft's SQL Server 2019 also comes with JSON support. Unlike MySQL, SQL Server doesn't have a native JSON data type, so JSON data is stored as strings. However, it does provide a number of built-in functions for querying and manipulating JSON data. Here's an example of how to query a JSON document in SQL Server:

SELECT JSON_VALUE(json_column, '$.key') FROM table_name WHERE JSON_VALUE(json_column, '$.key') = 'value';

IBM's DB2 Database 11.5 offers JSON functions and operators that allow you to manipulate JSON data stored as strings. Here's an example of how you can query JSON data in DB2:

SELECT JSON_VALUE(json_column, '$.key') FROM table_name WHERE JSON_VALUE(json_column, '$.key') = 'value';

Microsoft Azure SQL Database and Azure Synapse Analytics also offer support for JSON. They provide a similar set of JSON functions as SQL Server 2019, so you can query, update, and format JSON data stored in these services. The ability to handle JSON data is especially useful in Azure Synapse Analytics, where you can combine SQL and Spark to process big data and serve it up for analysis.

In conclusion, the MySQL Shell, along with the X DevAPI, provides a powerful way to work with JSON documents in MySQL. By offering support for JSON, MySQL and other databases, including SQL Server 2019, DB2 11.5, and Azure SQL, allow developers to effectively manage and manipulate JSON data. This opens up new possibilities for developing data-driven applications and services that leverage the power of JSON.