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select * from dba_users;
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select * from user_users;
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select * from user_sys_privs;
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RoomID Room.RoomID%Type;
RoomName Room.RoomName%Type;
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select RoomID,RoomName
from Room;
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open crRoom;loop;
fetch crRoom into RoomID,RoomName;
exit when crRoom%notFound;
end loop;
close crRoom;
end;
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