RANDOMKEY
Syntax
        RANDOMKEY
- Available since:
 - 1.0.0
 - Time complexity:
 - O(1)
 - ACL categories:
 - 
              
                
@keyspace,@read,@slow, 
Return a random key from the currently selected database.
RESP2 Reply
One of the following:
- Nil reply: when the database is empty.
 - Bulk string reply: a random key in database.
 
RESP3 Reply
One of the following:
- Null reply: when the database is empty.
 - Bulk string reply: a random key in the database.