在mysql中选择关闭的请求但是获取错误意味着servlet不显示结果

Question

我想在servlet中只选择待处理的请求

String sql = SELECT emailid as request,status as Request_Time,  etr as ETR_Time
               FROM it_Service_ticket
               INNER JOIN it_problem ON
    it_service_ticket.it_problem_id=it_problem.it_problem_id
               WHERE status="closed";

PreparedStatement pst = con.prepareStatement(sql);