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select * from tab/dba_tables/dba_objects/cat; 
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select table_name from user_tables;  //µ±Ç°Óû§µÄ±í   
    
select table_name from all_tables;  //ËùÓÐÓû§µÄ±í   
    
select table_name from dba_tables;  //°üÀ¨ÏµÍ³±í 


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