Hint:Parameter 'in' is declared but never used in 'query_student'

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1、错误描述

2、错误原因

create or replace procedure query_student(in id int) is 
begin
  select * from t_stu_info t where t.id = id; end query_student;

3、解决办法

create or replace procedure query_student(id in int) is 
begin
  select * from t_stu_info t where t.id = id; end query_student;

create or replace procedure query_student(id in int,name out varchar2) is 
begin
  select t.name into name from t_stu_info t where t.id = id; 
end query_student;

Hint:Parameter 'in' is declared but never used in 'query_student'

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原文地址：http://blog.csdn.net/you23hai45/article/details/50165793