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-- (1) 比较条件查询： 需求： 查询所有借阅日期早于2024年1月1日的借阅记录，返回借阅ID、读者ID、图书ID和借阅日期。
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SELECT loan_id, reader_id, book_id, loan_dateFROM LoanRecordWHERE loan_date < '2024-01-01';
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-- (2) 需求： 查询借阅超过30天的图书借阅记录，返回借阅ID、读者ID、图书ID、借阅日期和应还日期。
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SELECT loan_id, reader_id, book_id, loan_date, due_dateFROM LoanRecordWHERE DATEDIFF(CURRENT_DATE, loan_date) > 30;
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-- (3) 需求：查询借书次数超过５次的读者姓名
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SELECT R.reader_name
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FROM Reader R
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JOIN Loan L ON R.reader_id = L.reader_id
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GROUP BY R.reader_name
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HAVING COUNT(L.loan_id) > 5;
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-- (4)需求：查询借阅日期在２０２３年之后的所有图书标题
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SELECT B.book_title
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FROM Book B
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JOIN Loan L ON B.book_id = L.book_id
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WHERE L.loan_date > '2023-01-01';
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-- (5) 集合比较查询： 需求： 查询所有节约过的图书ID和标题，且这些图书至少被两位不同的读者借阅过。
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SELECT B.book_id, B.book_title
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FROM Book B
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JOIN Loan L ON B.book_id = L.book_id
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GROUP BY B.book_id
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HAVING COUNT(DISTINCT L.reader_id) > 1;
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-- (6)需求：查询所有曾经借阅过数学类图书的学生姓名
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SELECT DISTINCT R.reader_name
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FROM Reader R
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JOIN Loan L ON R.reader_id = L.reader_id
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JOIN Book B ON L.book_id = B.book_id
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WHERE B.book_type = '数学' AND R.reader_type = '学生';
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-- (7)范围比较查询：需求：查询借阅时长在３０天以上的所有借阅记录
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SELECT L.loan_id, R.reader_name, B.book_title, DATEDIFF(L.return_date, L.loan_date) AS loan_duration
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FROM Loan L
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JOIN Reader R ON L.reader_id = R.reader_id
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JOIN Book B ON L.book_id = B.book_id
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WHERE DATEDIFF(L.return_date, L.loan_date) > 30;
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-- (8)需求：查询借阅期限为２０到６０天的图书
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SELECT L.loan_id, R.reader_name, B.book_title
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FROM Loan L
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JOIN Reader R ON L.reader_id = R.reader_id
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JOIN Book B ON L.book_id = B.book_id
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WHERE DATEDIFF(L.return_date, L.loan_date) BETWEEN 20 AND 60;
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-- (9)字符串相似比较：需求：查询标题中包含“数据”的所有图书信息
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SELECT B.book_id, B.book_title, B.author
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FROM Book B
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WHERE B.book_title LIKE '%数据%';
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-- (10)需求：查询所有以“王”字为开头的读者姓名
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SELECT R.reader_name
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FROM Reader R
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WHERE R.reader_name LIKE '王%';
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-- (11)多表连接查询： 需求：查询每位读者借阅的所有图书标题及借阅日期
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SELECT R.reader_name, B.book_title, L.loan_date
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FROM Loan L
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JOIN Reader R ON L.reader_id = R.reader_id
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JOIN Book B ON L.book_id = B.book_id;
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-- (12)需求：查询每位教师的借阅规则，包括借阅数量、借阅期限。
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SELECT R.reader_name, RLR.max_books, RLR.loan_duration, RLR.max_renewals
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FROM Reader R
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JOIN ReaderLoanRules RLR ON R.reader_id = RLR.reader_id
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WHERE R.reader_type = '教师';
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-- (12)嵌套查询：需求：查询借阅超过３本书的学生姓名。
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SELECT R.reader_name
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FROM Reader R
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WHERE R.reader_type = '学生'
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AND R.reader_id IN (
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SELECT L.reader_id
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FROM Loan L
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GROUP BY L.reader_id
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HAVING COUNT(L.loan_id) > 3
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);
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-- (13)需求：查询借阅最多图书的读者姓名和借阅的图书数量
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SELECT R.reader_name, (SELECT COUNT(*) FROM Loan L WHERE L.reader_id = R.reader_id) AS book_count
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FROM Reader R
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ORDER BY book_count DESC
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LIMIT 1;
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-- (14)EXISTS查询：需求：查询至少借阅一本书的学生姓名
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SELECT R.reader_name
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FROM Reader R
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WHERE R.reader_type = '学生'
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AND EXISTS (
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SELECT 1
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FROM Loan L
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WHERE L.reader_id = R.reader_id
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);
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-- (15)需求：查询所有借阅过“计算机”类图书的教师姓名
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SELECT R.reader_name
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FROM Reader R
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WHERE R.reader_type = '教师'
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AND EXISTS (
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SELECT 1
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FROM Loan L
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JOIN Book B ON L.book_id = B.book_id
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WHERE L.reader_id = R.reader_id AND B.book_type = '计算机'
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);
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-- (16)排序和分组：需求：查询借阅每个图书类别的借阅次数最多的图书
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SELECT B.book_title, B.book_type, COUNT(L.loan_id) AS loan_count
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FROM Loan L
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JOIN Book B ON L.book_id = B.book_id
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GROUP BY B.book_type, B.book_title
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ORDER BY loan_count DESC
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LIMIT 1;
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-- (17)需求：查询每月借阅次数最多的读者姓名
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SELECT R.reader_name, COUNT(L.loan_id) AS loan_count
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FROM Loan L
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JOIN Reader R ON L.reader_id = R.reader_id
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WHERE YEAR(L.loan_date) = 2023
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GROUP BY MONTH(L.loan_date), R.reader_name
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ORDER BY loan_count DESC;
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-- (18)需求：查询某本书是否被预约
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SELECT EXISTS (
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SELECT 1
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FROM ReservationRecord
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WHERE book_id = 1
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) AS is_reserved;
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-- (19)需求：查询未被预约的图书信息
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SELECT book_id, book_name, author FROM Book WHERE book_id NOT IN (SELECT book_id FROM ReservationRecord);
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-- (20)需求：查询借阅记录中，归还日期晚于应还日期的记录
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SELECT loan_id, reader_id, book_id, loan_date, return_date FROM LoanRecord WHERE return_date > due_date;
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-- 数据更新 --
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-- 更新需求 1: 更新借阅记录的归还日期
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UPDATE LoanRecord
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SET return_date = '2024-12-20'
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WHERE reader_id = 1 AND return_date IS NULL;
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-- 更新需求 2:更新图书的借阅状态为已借出
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UPDATE Book
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SET status = '已借出'
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WHERE book_id = 101;
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-- 更新需求 3: 更新读者的联系方式
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UPDATE Reader
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SET contact_info = '123-456-7890'
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WHERE reader_id = 5;
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-- 更新需求 4: 更新罚款金额上限
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UPDATE FineRecord
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SET fine_amount = 100
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WHERE fine_amount > 100;
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-- 更新需求 5: 更新图书分类为“编程语言”
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UPDATE Book
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SET category_id = (SELECT category_id FROM BookCategory WHERE category_name = '编程语言')
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WHERE category_id = (SELECT category_id FROM BookCategory WHERE category_name = '计算机科学');
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-- 更新需求 6: 更新借阅记录的应归还日期
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UPDATE LoanRecord
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SET due_date = DATE_ADD(due_date, INTERVAL 10 DAY)
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WHERE loan_id = 123;
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-- 更新需求 7: 更新图书的出版日期
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UPDATE Book
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SET publish_date = '2024-01-01'
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WHERE book_id = 201;
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-- 更新需求 8: 更改借阅记录的图书名称（若图书名称发生更改）
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UPDATE LoanRecord L
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JOIN Book B ON L.book_id = B.book_id
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SET B.book_name = '高级编程'
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WHERE B.book_id = 50;
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-- 更新需求 9: 更新图书评论中的评分
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UPDATE BookReview
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SET rating = 4
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WHERE book_id = 200;
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-- 更新需求 10: 更新读者借阅约状态为“冻结”
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UPDATE Reader
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SET status = '冻结'
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WHERE reader_id = 3;
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-- 数据删除 --
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-- 删除需求 1: 删除过期预约记录
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DELETE FROM ReservationRecord
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WHERE reservation_date < '2024-01-01';
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-- 删除需求 2: 删除图书类别为“小说”的所有图书
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DELETE FROM Book
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WHERE category_id = (SELECT category_id FROM BookCategory WHERE category_name = '小说');
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-- 删除需求 3: 删除某个读者的所有借阅记录
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DELETE FROM LoanRecord
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WHERE reader_id = 7;
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-- 删除需求 4: 删除已归还的借阅记录
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DELETE FROM LoanRecord
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WHERE return_date IS NOT NULL;
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-- 删除需求 5: 删除没有罚款记录的读者
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DELETE FROM Reader
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WHERE reader_id NOT IN (SELECT DISTINCT reader_id FROM FineRecord);
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-- 删除需求 6: 删除借阅次数信号过２次的读者借阅记录
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DELETE FROM ReservationRecord
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WHERE reader_id IN (
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SELECT reader_id
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FROM LoanRecord
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GROUP BY reader_id
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HAVING COUNT(loan_id) > 2
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);
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-- 删除需求 7: 删除图书归还超过３０天的借阅记录
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DELETE FROM LoanRecord
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WHERE DATEDIFF(CURRENT_DATE, return_date) > 30;
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-- 删除需求 8: 删除过期的罚款记录
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DELETE FROM FineRecord
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WHERE fine_date < '2023-12-31';
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-- 删除需求 9: 删除所有失效的读者记录（失效是指没有借阅历史的读者）
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DELETE FROM Reader
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WHERE reader_id NOT IN (SELECT DISTINCT reader_id FROM LoanRecord);
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-- 删除需求 10: 删除无效的销售记录
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DELETE FROM sales_records WHERE amount = 0;
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