知识点：内连接

显示内连接

内连接又称等值连接，使用 INNER JOIN 关键字。

SELECT A.value, B.value
FROM tablea AS A INNER JOIN tableb AS B
ON A.key = B.key;

隐式内连接

可以不明确使用 INNER JOIN，而使用普通查询并在 WHERE 中将两个表中要连接的列用等值方法连接起来。

SELECT A.value, B.value
FROM tablea AS A, tableb AS B
WHERE A.key = B.key;

本题解答（隐式内连接解法）

select qpd.device_id, qpd.question_id, qpd.result from question_practice_detail as qpd
, user_profile as up where qpd.device_id = up.device_id and up.university = "浙江大学";