A.select*fromuser_tab_privs;
	B.select*fromuser_tables;
	C.select*fromuser_role_privs;
	D.select*fromuser_sequences;
 
                            
	A.Where
	B.Having
	C.Order by
	D.無法限定分組函數(shù)的返回
	A.VARCHAR2
	B.Long
	C.Long raw
	D.Clob
