student表
stu_id     stu_name
1            张三
2            李四
3            王五results表
r_id       stu_id      scores
1             1          88
2             1          77
3             2          45
4             2          78
5             3          69
6             3          80我想要的结果是:
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stu_name       scores
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张三            88
                77
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李四            45
                78
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王五            69
                80
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