请教关于mysql存储过程返回的结果集的问题

问题相关代码

CREATE PROCEDURE getDevQuestionAnswer ( _routeId BIGINT ( 11 ), _standardName VARCHAR ( 100 ) ) BEGIN
    SET @params = '';
    SELECT
        @params := CONCAT( @params, ',GROUP_CONCAT(if(topic= \'', topic, '\',answer,', '\'\')) as ', '\'', topic, '\'' ) AS aa 
    FROM
        ( SELECT DISTINCT topic FROM dev_questionnaireanswer WHERE routeId = _routeId AND standardName = _standardName and subitemType!='2' ) A;
    
    SET @sql = CONCAT ( 'select equipmentCode', @params, ' from `dev_questionnaireanswer`  WHERE subitemType!=',2,' and routeId =', _routeId, ' AND standardName =', '\'', _standardName, '\' GROUP BY equipmentCode' );
    PREPARE stmt 
    FROM
        @sql;
    EXECUTE stmt;
END;

-- 运行存储过程
CALL getDevQuestionAnswer ( 123,'标准1');

运行结果

我想要达到的结果

我只想要第二个结果集，我该如何处理

调整一下给变量赋值的方式，改用select xxx into @parm 的方式给变量赋值，就会不在result输出变量了