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1 spool
spool d:\test\table.dat
select * from table_name;
spool off
2 sqlplus user/password@sid @test.sql > table.dat
test.sql
     select * from table_name;
     exit;


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set heading off;   
set feedback off;   
spool c:\dropobj.sql;   
  prompt --Drop constraint   
 select 'alter t ......

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