Oracle date如何比较大小分析

sql代码

-- created on 2010/04/17 by nan
declare
-- local variables here
i integer;
v_date1 date;
v_date2 date;
begin
-- test statements here
v_date1 := sysdate;
v_date2 := to_date( '2008-09-08');
if v_date1 > v_date2 then
dbms_output.put_line( 'if');
else
dbms_output.put_line( 'else');
end if;
end;