How can one transfer JSON data from CosmosDB to SQL using Synapse?

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There are several ways to transfer JSON data from CosmosDB to SQL using Synapse, depending on your specific requirements and preferences. Here are a few options to consider:

1. Use the Azure Synapse Analytics Studio: With this option, you can use the Copy Data tool in the Azure Synapse Analytics Studio to configure a pipeline that extracts data from CosmosDB and loads it into SQL. You will need to provide details about the source and destination databases, map the columns, and set up any required transformations. Once the pipeline is configured, you can run it on-demand or schedule it to run automatically.

2. Use Azure Data Factory: Azure Data Factory is a cloud-based data integration service that enables you to create pipelines that move and transform data. You can use the Cosmos DB connector to extract data from CosmosDB and the SQL Server connector to load it into SQL. Similar to the Synapse Analytics Studio, you will need to configure the pipeline with the required details and mappings.

3. Use PolyBase: PolyBase is a feature in Azure Synapse Analytics that enables you to query external data sources from SQL. With this option, you can create an external table in SQL that points to the CosmosDB container, and then query the external table to retrieve JSON data. This option is best for scenarios where you want to join CosmosDB data with existing SQL data or where you need real-time access to CosmosDB data.

4. Use a custom solution: If none of the above options meet your needs, you can build a custom solution using Azure Functions or Azure Logic Apps. With Azure Functions, you can create a function that retrieves JSON data from CosmosDB and inserts it into SQL using the SQL Server driver. With Azure Logic Apps, you can build a workflow that triggers when new data is added to CosmosDB and automatically inserts it into SQL using the SQL Server connector.