<?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="com.casic.missiles.mapper.MeterFileMapper">

    <select id="selectMaxFileNo" resultType="long">
        SELECT IFNULL(max(RIGHT(file_no, 12)), 0) from meter_file
    </select>
</mapper>