mysql通过什么样的查询可以由图一三个表得到图二

[qq_40341627]

[听雨停了]

select a.*,b.score as EnglishScore,c.score as MathScore from student a left join EnglishScore b on a.id=b.stnum left join MathScore c on a.id=c.stnum

[二月十六]

SELECT  students.* ,
        EnglishScore.score AS EnglishSroce ,
        MathScore.score AS MathScore
FROM    students
        JOIN EnglishScore ON EnglishScore.stnum = students.id
        JOIN MathScore ON MathScore.stnum = students.id
WHERE   students.id = 15001

[凡人皆侑一死]

select b.stnum,a.name,b.socre as englishscore,c.score as mathscore 
from student a left join Englishscore b on a.id=b.stnum --通过student表的id跟englishscore表的stnum连接得出每个学生的英语成绩
left join mathsocre c on a.id=c.stnum    --通过student表的id跟mathscore表的stnum连接得出每个学生的数学成绩
where a.id=1

看看join语法就会明白了 http://www.w3school.com.cn/sql/sql_join.asp

[ACMAIN_CHM]

结帖率：0% 当您的问题得到解答后请及时结贴. http://topic.csdn.net/u/20090501/15/7548d251-aec2-4975-a9bf-ca09a5551ba5.html http://topic.csdn.net/u/20100428/09/BC9E0908-F250-42A6-8765-B50A82FE186A.html http://topic.csdn.net/u/20100626/09/f35a4763-4b59-49c3-8061-d48fdbc29561.html 8、如何给分和结贴？ http://bbs.csdn.net/help#post_dispose

[academic2015]

select EnglishScore.strNum,students.name,EnglishScore.score as EnglishScore,MathScore.score as MathScore from students,EnglishScore,MathScore where students.id=15001 and MathScore.strnum=15001 and English.strnum=15001