how to access ABAP schema tables(USR02) through MaxDB studio

i want to access ABAP schema tables eg.USR02.but i couldnt do that from MaxDB studio.its saying that "table is unknown".

Even i tried these commands

dbmcli -D <SID> -u user,pwd

dbmcli>sql_connect superdba,pwd

dbmcli>sql_execute select * from USR02

dbmcli >sql_execute select * from USR02

ERR

-24988,ERR_SQL: SQL error

-4004,Unknown table name:USR02

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Kindly help me out.

V r using MaxDB 7.7.02.11.....