<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="me.bello.luck.LuckDao" >


    <select id="doQueryHistoryList" resultType="HashMap">
        SELECT ${column}, count(*) as num from (
        SELECT ${column} FROM t_peroid  ORDER BY peroid DESC limit ${limit}
        ) t GROUP BY ${column} ORDER BY num DESC;

    </select>

    <select id="doQueryHistoryListAll" resultType="HashMap">

        SELECT peroid, a, b, c, d, e FROM t_peroid  ORDER BY peroid DESC limit #{limit};

    </select>



</mapper>