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DECLARE
TYPE CourseList IS TABLE OF VARCHAR2(10);
courses CourseList;
BEGIN
-- ³õʼ»¯Êý×éÔªËØ£¬´óСΪ3
courses := CourseList( 'Biol 4412 ', 'Psyc 3112 ', 'Anth 3001 ');
-- ΪÊý×éÔö¼ÓÒ»¸öÔªËØ£¬Êý×é´óСΪ4£¬Ä©Î²µÄÔªËØΪNULL
courses.EXTEND; -- append one null element
-- ΪÔö¼ÓµÄÔªËظ³Öµ£¬Èç¹ûûÓÃEXTEND£¬ÕâÀï»á³ö´í
courses(4) := 'Engl 2005 ';
end
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