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create table csdn
(name char(8),
age number(3),
ad char(50));
insert into csdn values ('aa',54,'dkfj');
insert into csdn values ('ab',5,'dkfj');
insert into csdn values ('aad',25,'dkfj');
insert into csdn values ('dd',(select max(age) from csdn where ad='dkfj'),'3003');