mybatis同一张表多次连接查询相同列赋值问题小结

CREATE TABLE `STUDENT_SCORE` (
 `score_id` int(11) unsigned NOT NULL AUTO_INCREMENT,//主键
 `test_id` int(11) NOT NULL,//标识考试信息
 `course` varchar(45) DEFAULT NULL,//课程名
 `score` float DEFAULT NULL,//分数
 PRIMARY KEY (`score_id`)
)

SELECT score0.test_id, core0.course, score0.score, score1.score, score2.score, score3.score
FROM (SELECT * FROM STUDENT_SCORE WHERE test_id='11') score0 
LEFT JOIN (SELECT * FROM STUDENT_SCORE WHERE test_id='12') score1
ON score0.course = score1.course
LEFT JOIN (SELECT * FROM STUDENT_SCORE WHERE test_id='13') score2
ON score0.course = score2.course
LEFT JOIN (SELECT * FROM STUDENT_SCORE WHERE test_id='14') score3
ON score0.course = score3.course

<select id="findVCCFrameworkCompareData" parameterType="java.util.HashMap" resultMap="frameworkCompareMapper">
   SELECT 
   score0.test_id, 
   core0.course, 
   score0.score, 
   score1.score, 
   score2.score, 
   score3.score
   FROM (SELECT * FROM STUDENT_SCORE WHERE test_id=#{id0}) score0 
   LEFT JOIN (SELECT * FROM STUDENT_SCORE WHERE test_id=#{id1}) score1
   ON score0.course = score1.course
   LEFT JOIN (SELECT * FROM STUDENT_SCORE WHERE test_id=#{id2}) score2
   ON score0.course = score2.course
   LEFT JOIN (SELECT * FROM STUDENT_SCORE WHERE test_id=#{id3}) score3
   ON score0.course = score3.course
</select>

SELECT
score0.test_id,
core0.course,
score0.score,
score1.score,
score2.score,
score3.score
FROM (SELECT * FROM STUDENT_SCORE score0 WHERE score0.test_id=#{score0}) score0
LEFT JOIN (SELECT * FROM STUDENT_SCORE score1 WHERE score1.test_id=#{score1}) score1
ON score0.course = score1.course
LEFT JOIN (SELECT * FROM STUDENT_SCORE score2 WHERE score2.test_id=#{score2}) score2
ON score0.course = score2.course
LEFT JOIN (SELECT * FROM STUDENT_SCORE score3 WHERE score3.test_id=#{score3}) score3
ON score0.course = score3.course