sql優(yōu)化要求不要寫*,要把表名寫全

<?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="usernp">
<sql id="columns">
id,name,addr,age
</sql>
<select id="ifsql" resultType="User">
    select <include refid="columns"/> from user 
    where id={#id}
    and name=#{name}
    and addr=#{addr}
</select>
</mapper>