Oracle how to write this clause?

2012-02-25  Source: Original Site  Category:Oracle  Views:1 

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create type courselist as table of varchar2(20);

create table department (
name varchar2(20),
director varchar2(20),
courses courselist)
nested table courses store as courses_tab;

begin
insert into department values('english','david',courselist('hello','bad'));
end;

now ,i want to update the element 'english' as 'chinese',and delete the 'david' element.how to write it ?

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