Reference:
https://docs.microsoft.com/en-us/azure/azure-sql/database/features-comparison

Reference:
https://docs.microsoft.com/en-us/sql/ssdt/project-oriented-offline-database-development?view=sql-serverver15

Reference:
https://docs.microsoft.com/en-us/azure/storage/blobs/data-lake-storage-access-control

Data visualization is a key component in being able to gain insight into your data. It helps make big and small data easier for humans to understand. It also makes it easier to detect patterns, trends, and outliers in groups of data.
Data visualization brings data to help you find key business insights quickly and effectively.
Reference:
https://docs.microsoft.com/en-us/azure/synapse-analytics/spark/apache-spark-data-visualization

You must create a separate account for each API.
Reference:
https://docs.microsoft.com/en-us/azure/cosmos-db/how-to-manage-database-account