写出sql语句实现查询，“数据库”课程成绩大于80的学生姓名，自定义表结构，并对语法树进行代数优化

自定义表结构如下：

CREATE TABLE Student (
    id INT PRIMARY KEY,
    name VARCHAR(20)
);

CREATE TABLE Course (
    id INT PRIMARY KEY,
    name VARCHAR(20)
);

CREATE TABLE Score (
    student_id INT,
    course_id INT,
    score INT,
    PRIMARY KEY (student_id, course_id),
    FOREIGN KEY (student_id) REFERENCES Student(id),
    FOREIGN KEY (course_id) REFERENCES Course(id)
);

查询语句如下：

SELECT Student.name
FROM Student
JOIN Score ON Student.id = Score.student_id
WHERE Score.score > 80;

代数优化后的语法树如下：

PROJECT(name)
 |
 JOIN(Student.id = Score.student_id)
 |    |
 |    SELECT(Score.score > 80)
 |        |
 |        SCORE
 |
 STUDENT