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set serveroutput on size 100000 // ´ò¿ª ·þÎñÆ÷µÄÊä³ö on ºóÃæÊÇ »º´æµÄ´óС ·¶Î§ÊÇ (2000 ÖÁ 1000000)
begin
dbms_output.put_line('hello world');
end;
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