There's nothing in the Redis server itself that will do this for you. A Redis client program is software, so it can perform any actions that the programmer writes into it, including reading data out of a Redis server, refactoring the data into a SQL table/column schema, and writing the data into a SQL database server. The client program for doing this will have to be custom written for your situation, since your Redis key/value relationships and your SQL db table/column schema are unique to you.
-Greg