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Assuming I have an external source which has an REST/SOAP API returning JSON data, Is it possible to read a REST or SOAP API and load JSON data into Qlik?
Yes, this is possible.
Just use the Qlik REST Connector.
You can do a select on the json string to create a data model.
SQL Select Id,
from your table
This will then create a table with Name and Address as the two column..
I think this is what you meant.
This is very helpful. Do you have any idea what the performance implications of this strategy would be? Also, would there be a way to load the column names dynamically based on the Key in the JSON?
Performance should be based on the sql server as you are passing the query to the database and the database itself is doing the work. for Json_Value function, I think you need to know the name of the column as it goes by the path($.Key) however if your database is not an azure and has an object OpenJson you can use that, it can be call dynamically (like select * from table) here's the info for both: OpenJSON - https://msdn.microsoft.com/en-us/library/dn921885.aspx JSON_Value - https://msdn.microsoft.com/en-us/library/dn921898.aspx