If you:
SQL> select * from CUSTOMERS@hsodbc; select * from CUSTOMERS@hsodbc * ERROR at line 1: ORA-00942: table or view does not exist [Generic Connectivity Using ODBC] ORA-02063: preceding 2 lines from HSODBC
It may of course be because you have mistyped the table name.
It could mean the table contains a wide character that the Oracle application has problems with. To solve this, add the following attribute to the Easysoft ODBC driver data source within the odbc.ini file:
disguisewide = 1
This will allow the data to be represented within sql*plus.