1. 經常使用類似left join做查詢，偶爾遇到兩張表的欄位名相同（即column名字一致），此時可以在mybatis中這樣配置

例子：

    <select id="demo" resultMap="DemoResultMap">
        SELECT DISTINCT
               t1.username,
               t1.password,

               t2.username "t2_username",
               t2.age
          FROM table1 t1
          LEFT JOIN table2 t2
            ON t1.id = t2.id
         WHERE t1.age = #{age,jdbcType=VARCHAR}
    </select>
    <resultMap id="DemoResultMap" type="com.demo.vo.UserVo" >
        <id column="id"  property="id" jdbcType="VARCHAR"/>
        <result column="username" property="username" jdbcType="VARCHAR"/>
        <result column="password" property="password" jdbcType="VARCHAR"/>
        
        <result column="t2_username" property="t2Username" jdbcType="VARCHAR"/>
        <result column="age"  property="age" jdbcType="VARCHAR"/>
    </resultMap>
 

參考：