为什么select不走索引呢？

select "环节号","案件记录号","市民姓名","市民电话","录入时间","领导批示","办理时间","案件类型","接线员","详细地址","主办部门","数据来源","办理方案","派单员","派单员备注","退回重办说明","案件公文号","隐藏当事人资料","来话内容","案件级别","派发时间","实际完成时间","规定完成时间","是否回访","前台案件类型","主办发送标志

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