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数据库脚本/查询.sql

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+--比较条件
+----1.查询所有性别为“女”的用户信息
+SELECT * FROM user WHERE sex = '女';
+----2.查询所有清洗费用大于80的订单
+SELECT * FROM order WHERE cost > 80;
+----3.查询所有洗衣机状态为“空闲”的洗衣机
+SELECT * FROM wmachine WHERE state = '空闲';
+----4.查询所有衣物数量为1的衣物记录
+SELECT * FROM cloth WHERE quantity = 1;
+----5.查询所有用户的手机号码，并排除邮箱为“aaaaa@abc.com”的用户
+SELECT name, phoneNumber FROM user WHERE email <> 'aaaaa@abc.com';
+
+--集合比较
+----1.查询所有评价类型为“四星”或“五星”的评价
+SELECT * FROM evaluation WHERE type IN ('四星','五星');
+----2.查询所有衣物类型为“毛衣”或“卫衣”的衣物信息
+SELECT * FROM cloth WHERE clothType IN ('毛衣', '卫衣');
+
+--范围比较
+----1.查询所有清洗费用在50到100之间的订单
+SELECT * FROM `order` WHERE cost BETWEEN 50 AND 100;
+----2.查询所有预约申请日期在2024年9月1日之后的预约
+SELECT * FROM reservation WHERE applicationTime > '2024-09-01';
+----3.查询最新的公告信息
+SELECT * FROM announcement ORDER BY addTime DESC LIMIT 1;
+
+--字符串相似比较
+----1.查询所有用户名中包含“李”的用户
+SELECT * FROM user WHERE name LIKE '%李%';
+----2.查询所有评价内容以“好评”开头的评价
+SELECT * FROM evaluation WHERE content LIKE '好评%';
+----3.查询所有评价内容包含“好”的评价
+SELECT * FROM evaluation WHERE content LIKE '%好%';
+
+--多表连接
+----1.查询所有预约及其对应用户的邮箱和申请日期
+SELECT r.reservationID, u.email, r.applicationTime 
+FROM reservation r 
+JOIN user u ON r.userID = u.userID;
+----2.查询所有订单及其对应用户的姓名和手机号
+SELECT o.orderID, u.name, u.phoneNumber 
+FROM `order` o 
+JOIN user u ON o.userID = u.userID;
+----3.查询所有订单及其对应的日志
+SELECT 
+    o.orderID, o.addTime AS orderAddTime, o.cost, l.logID, l.addTime AS logAddTime, l.state AS logState
+FROM `order` o
+JOIN log l ON o.orderID = l.orderID;
+--嵌套查询
+----1.查询所有清洗费用高于平均费用的订单
+SELECT * FROM `order` 
+WHERE cost > (SELECT AVG(cost) FROM order);
+----2.查询所有有超过1条评价的用户信息
+SELECT * FROM user 
+WHERE userID IN (SELECT userID FROM evaluation GROUP BY userID HAVING COUNT(*) > 1);
+
+--EXISTS查询
+----1.查询所有有评价的用户
+SELECT * FROM user u 
+WHERE EXISTS (SELECT 1 FROM evaluation e WHERE e.userID = u.userID);
+----2.查询所有有未审核预约的用户
+SELECT * FROM user u 
+WHERE EXISTS (SELECT 1 FROM reservation r WHERE r.userID = u.userID AND r.examine = '否');