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select savebillin0_.*,entityacct2_.*
from save_bill_info savebillin0_,
CUST_INFO custinfo1_,
entity_acct_bill entityacct2_
where savebillin0_.cust_id = custinfo1_.ID
and entityacct2_.ACCOUT_ID =
(select max(entityacct3_.ACCOUT_ID)
from entity_acct_bill entityacct3_
where entityacct3_.SAVEBILL_ID = savebillin0_.SAVEBILL_ID)
and savebillin0_.OPER_STATUS <> 'BPP00'
and savebillin0_.ADSCRIPTION_ID = '00010015'
order by entityacct2_.OPER_DATE desc   
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1.commit;rollback;
2.select * from dictionary;
describe dba_users;
select * from dba_users;
select name from v$controlfile;
3.
alter database drop logfile group 3
select archiver from v$instance;
alter tablespace userdata read only;
4.
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