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create or replace procedure test(studentid)
....
select * from student where sid=studentid
if sql%count=1 then
    begin
        ²Ù×÷1
    end
end if;
if sql%count=0 then
    begin
        ²Ù×÷2
    end
end if;
....
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create or replace procedure test(studentid)
....
  num int;
.....
select count(*) into num from student where sid=studentid
if num=1 then
    begin
        ²Ù×÷1
    end
end if;
if num=0 then
    begin
        ²Ù×÷2
    end
end if;
....

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select count(*) into num
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