Namespace Resolution
You can grant authorization permissions to a namespace to determine who can access both the namespace and the tables within it.
To resolve a table from a 
               table_name that appears in an SQL
            statement, the following rules apply:
                  - 
                        
                        - If the table_namecontains a namespace name, no resolution is needed, because a qualified table name uniquely identifies a table.
- If you don't specify a namespace name explicitly, the
                            namespace used is the one contained in the
                                ExecuteOptionsinstance that is given as input to theexecuteSync(),execute(), orprepare()methods of TableAPI.
- If ExecuteOptionsdoesn't specify a namespace, the default sysdefault namespace is used.
 
- If the 
Using different namespaces in ExecuteOptions allows executing the same
            queries on separate but similar tables.