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select s.*  from t_info t,t_info_class_relationship s where t.id=s.info_id and t.status is not null and s.class_id in(
select a.id
    from T_INFO_CLASS a
    start with a.parent_id=39902
    connect by prior
    a.id =parent_id union
    select 39902 from dual)


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ͨÓñí±í´ïʽ Common Table Expressions
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('pubs'
,'IsFulltextEnabled'
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'enable'
       ¹Ø±Õ´Ë¹¦ÄÜ
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if not object_id('Class') is null
drop table Class
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Create table Class([Student] nvarchar(2),[Course] nvarchar(2),[Score] int)
Insert Class
select N'ÕÅÈý',N'ÓïÎÄ',78 union all
select N'ÕÅÈý',N'Êýѧ',87 union all
select N'ÕÅÈý',N'Ó¢Óï',82 union all
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select count(1) from dictionary;
select * from dba_data_files;
select count(1) from dba_objects t where t.owner='BESTTONE';
select * from dba_tablespaces t where t.tablespace_name='BESTTONE';
select count(1) from dba_tables t where t.owner='BESTTONE';
select t.table_name,t.comments from diction ......
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