Hi @Ramesh Kanagaraj Welcome to the Microsoft Q&A forum, and sorry for the trouble you are facing
As we understand the ask here is you want to connect Azure API for FHIR with Azure SQL and looking for some documentation.
Are you trying the OSS version or the managed services?
You can choose the backend only while deploying the OSS version. Managed services do not give you an option to change the backend.
Azure API for FHIR internally uses Cosmos DB backend, and the FHIR server in AHDS uses SQL backend. Unfortunately, you cannot change these. Also, you do not have direct access to the backend in managed services
You can find the git repo on OSS Here for more information on Managed service please check here
Please let e me know if you are looking for any additional information.
Regards
Geetha
Please don't forget to click on or upvote button whenever the information provided helps you. Original posters help the community find answers faster by identifying the correct answer.