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select *
from User u
where u.user_name in (select u.user_name
from User u
group by u.user_name having count(*) > 1)
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TableA
id customer PhoneNo
001 ÕÅÈý 777777
002 ÀîËÄ 444444
003 ÍõÎå 555555
004 ÕÅÈý 777777
005 ÕÅÈý 777777
006 ÍõÎå 555555
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001 ÕÅÈý 777777
002 ÀîËÄ 444444
003 ÍõÎå 555555
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create table TableA ( id varchar(3),customer varchar(5),PhoneNo varchar(6))
insert into TableA select '001','ÕÅÈý','777777'
union all select '002','ÀîËÄ','444444'
union all select '003','ÍõÎå','555555'
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desc v$object_usage;
set linesize 190
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(
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TemplateMode NUMBER
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RETURN NUMBER
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