-   数据库专项练习

    -   [0175.组合两个表](/database-solution/0100-0199/0175.Combine%20Two%20Tables/README.md)
    -   [0176.第二高的薪水](/database-solution/0100-0199/0176.Second%20Highest%20Salary/README.md)
    -   [0177.第 N 高的薪水](/database-solution/0100-0199/0177.Nth%20Highest%20Salary/README.md)
    -   [0178.分数排名](/database-solution/0100-0199/0178.Rank%20Scores/README.md)
    -   [0180.连续出现的数字](/database-solution/0100-0199/0180.Consecutive%20Numbers/README.md)
    -   [0181.超过经理收入的员工](/database-solution/0100-0199/0181.Employees%20Earning%20More%20Than%20Their%20Managers/README.md)
    -   [0182.查找重复的电子邮箱](/database-solution/0100-0199/0182.Duplicate%20Emails/README.md)
    -   [0183.从不订购的客户](/database-solution/0100-0199/0183.Customers%20Who%20Never%20Order/README.md)
    -   [0184.部门工资最高的员工](/database-solution/0100-0199/0184.Department%20Highest%20Salary/README.md)
    -   [0185.部门工资前三高的所有员工](/database-solution/0100-0199/0185.Department%20Top%20Three%20Salaries/README.md)
    -   [0196.删除重复的电子邮箱](/database-solution/0100-0199/0196.Delete%20Duplicate%20Emails/README.md)
    -   [0197.上升的温度](/database-solution/0100-0199/0197.Rising%20Temperature/README.md)
    -   [0262.行程和用户](/database-solution/0200-0299/0262.Trips%20and%20Users/README.md)
    -   [0511.游戏玩法分析 I](/database-solution/0500-0599/0511.Game%20Play%20Analysis%20I/README.md)
    -   [0512.游戏玩法分析 II](/database-solution/0500-0599/0512.Game%20Play%20Analysis%20II/README.md)
    -   [0534.游戏玩法分析 III](/database-solution/0500-0599/0534.Game%20Play%20Analysis%20III/README.md)
    -   [0550.游戏玩法分析 IV](/database-solution/0500-0599/0550.Game%20Play%20Analysis%20IV/README.md)
    -   [0569.员工薪水中位数](/database-solution/0500-0599/0569.Median%20Employee%20Salary/README.md)
    -   [0570.至少有 5 名直接下属的经理](/database-solution/0500-0599/0570.Managers%20with%20at%20Least%205%20Direct%20Reports/README.md)
    -   [0571.给定数字的频率查询中位数](/database-solution/0500-0599/0571.Find%20Median%20Given%20Frequency%20of%20Numbers/README.md)
    -   [0574.当选者](/database-solution/0500-0599/0574.Winning%20Candidate/README.md)
    -   [0577.员工奖金](/database-solution/0500-0599/0577.Employee%20Bonus/README.md)
    -   [0578.查询回答率最高的问题](/database-solution/0500-0599/0578.Get%20Highest%20Answer%20Rate%20Question/README.md)
    -   [0579.查询员工的累计薪水](/database-solution/0500-0599/0579.Find%20Cumulative%20Salary%20of%20an%20Employee/README.md)
    -   [0580.统计各专业学生人数](/database-solution/0500-0599/0580.Count%20Student%20Number%20in%20Departments/README.md)
    -   [0584.寻找用户推荐人](/database-solution/0500-0599/0584.Find%20Customer%20Referee/README.md)
    -   [0585.2016 年的投资](/database-solution/0500-0599/0585.Investments%20in%202016/README.md)
    -   [0586.订单最多的客户](/database-solution/0500-0599/0586.Customer%20Placing%20the%20Largest%20Number%20of%20Orders/README.md)
    -   [0595.大的国家](/database-solution/0500-0599/0595.Big%20Countries/README.md)
    -   [0596.超过 5 名学生的课](/database-solution/0500-0599/0596.Classes%20More%20Than%205%20Students/README.md)
    -   [0597.好友申请 I：总体通过率](/database-solution/0500-0599/0597.Friend%20Requests%20I%20Overall%20Acceptance%20Rate/README.md)
    -   [0601.体育馆的人流量](/database-solution/0600-0699/0601.Human%20Traffic%20of%20Stadium/README.md)
    -   [0602.好友申请 II ：谁有最多的好友](/database-solution/0600-0699/0602.Friend%20Requests%20II%20Who%20Has%20the%20Most%20Friends/README.md)
    -   [0603.连续空余座位](/database-solution/0600-0699/0603.Consecutive%20Available%20Seats/README.md)
    -   [0607.销售员](/database-solution/0600-0699/0607.Sales%20Person/README.md)
    -   [0608.树节点](/database-solution/0600-0699/0608.Tree%20Node/README.md)
    -   [0610.判断三角形](/database-solution/0600-0699/0610.Triangle%20Judgement/README.md)
    -   [0612.平面上的最近距离](/database-solution/0600-0699/0612.Shortest%20Distance%20in%20a%20Plane/README.md)
    -   [0613.直线上的最近距离](/database-solution/0600-0699/0613.Shortest%20Distance%20in%20a%20Line/README.md)
    -   [0614.二级关注者](/database-solution/0600-0699/0614.Second%20Degree%20Follower/README.md)
    -   [0615.平均工资：部门与公司比较](/database-solution/0600-0699/0615.Average%20Salary%20Departments%20VS%20Company/README.md)
    -   [0618.学生地理信息报告](/database-solution/0600-0699/0618.Students%20Report%20By%20Geography/README.md)
    -   [0619.只出现一次的最大数字](/database-solution/0600-0699/0619.Biggest%20Single%20Number/README.md)
    -   [0620.有趣的电影](/database-solution/0600-0699/0620.Not%20Boring%20Movies/README.md)
    -   [0626.换座位](/database-solution/0600-0699/0626.Exchange%20Seats/README.md)
    -   [0627.变更性别](/database-solution/0600-0699/0627.Swap%20Salary/README.md)
    -   [1045.买下所有产品的客户](/database-solution/1000-1099/1045.Customers%20Who%20Bought%20All%20Products/README.md)
    -   [1050.合作过至少三次的演员和导演](/database-solution/1000-1099/1050.Actors%20and%20Directors%20Who%20Cooperated%20At%20Least%20Three%20Times/README.md)
    -   [1068.产品销售分析 I](/database-solution/1000-1099/1068.Product%20Sales%20Analysis%20I/README.md)
    -   [1069.产品销售分析 II](/database-solution/1000-1099/1069.Product%20Sales%20Analysis%20II/README.md)
    -   [1070.产品销售分析 III](/database-solution/1000-1099/1070.Product%20Sales%20Analysis%20III/README.md)
    -   [1075.项目员工 I](/database-solution/1000-1099/1075.Project%20Employees%20I/README.md)
    -   [1076.项目员工 II](/database-solution/1000-1099/1076.Project%20Employees%20II/README.md)
    -   [1077.项目员工 III](/database-solution/1000-1099/1077.Project%20Employees%20III/README.md)
    -   [1082.销售分析 I ](/database-solution/1000-1099/1082.Sales%20Analysis%20I/README.md)
    -   [1083.销售分析 II](/database-solution/1000-1099/1083.Sales%20Analysis%20II/README.md)
    -   [1084.销售分析 III](/database-solution/1000-1099/1084.Sales%20Analysis%20III/README.md)
    -   [1097.游戏玩法分析 V](/database-solution/1000-1099/1097.Game%20Play%20Analysis%20V/README.md)
    -   [1098.小众书籍](/database-solution/1000-1099/1098.Unpopular%20Books/README.md)
    -   [1107.每日新用户统计](/database-solution/1100-1199/1107.New%20Users%20Daily%20Count/README.md)
    -   [1112.每位学生的最高成绩](/database-solution/1100-1199/1112.Highest%20Grade%20For%20Each%20Student/README.md)
    -   [1113.报告的记录](/database-solution/1100-1199/1113.Reported%20Posts/README.md)
    -   [1126.查询活跃业务](/database-solution/1100-1199/1126.Active%20Businesses/README.md)
    -   [1127.用户购买平台](/database-solution/1100-1199/1127.User%20Purchase%20Platform/README.md)
    -   [1132.报告的记录 II](/database-solution/1100-1199/1132.Reported%20Posts%20II/README.md)
    -   [1141.查询近 30 天活跃用户数](/database-solution/1100-1199/1141.User%20Activity%20for%20the%20Past%2030%20Days%20I/README.md)
    -   [1142.过去 30 天的用户活动 II](/database-solution/1100-1199/1142.User%20Activity%20for%20the%20Past%2030%20Days%20II/README.md)
    -   [1148.文章浏览 I](/database-solution/1100-1199/1148.Article%20Views%20I/README.md)
    -   [1149.文章浏览 II](/database-solution/1100-1199/1149.Article%20Views%20II/README.md)
    -   [1158.市场分析 I](/database-solution/1100-1199/1158.Market%20Analysis%20I/README.md)
    -   [1159.市场分析 II](/database-solution/1100-1199/1159.Market%20Analysis%20II/README.md)
    -   [1164.指定日期的产品价格](/database-solution/1100-1199/1164.Product%20Price%20at%20a%20Given%20Date/README.md)
    -   [1173.即时食物配送 I](/database-solution/1100-1199/1173.Immediate%20Food%20Delivery%20I/README.md)
    -   [1174.即时食物配送 II](/database-solution/1100-1199/1174.Immediate%20Food%20Delivery%20II/README.md)
    -   [1179.重新格式化部门表](/database-solution/1100-1199/1179.Reformat%20Department%20Table/README.md)
    -   [1193.每月交易 I](/database-solution/1100-1199/1193.Monthly%20Transactions%20I/README.md)
    -   [1194.锦标赛优胜者](/database-solution/1100-1199/1194.Tournament%20Winners/README.md)
    -   [1204.最后一个能进入巴士的人](/database-solution/1200-1299/1204.Last%20Person%20to%20Fit%20in%20the%20Bus/README.md)
    -   [1205.每月交易 II](/database-solution/1200-1299/1205.Monthly%20Transactions%20II/README.md)
    -   [1211.查询结果的质量和占比](/database-solution/1200-1299/1211.Queries%20Quality%20and%20Percentage/README.md)
    -   [1212.查询球队积分](/database-solution/1200-1299/1212.Team%20Scores%20in%20Football%20Tournament/README.md)
    -   [1225.报告系统状态的连续日期](/database-solution/1200-1299/1225.Report%20Contiguous%20Dates/README.md)
    -   [1241.每个帖子的评论数](/database-solution/1200-1299/1241.Number%20of%20Comments%20per%20Post/README.md)
    -   [1251.平均售价](/database-solution/1200-1299/1251.Average%20Selling%20Price/README.md)
    -   [1264.页面推荐](/database-solution/1200-1299/1264.Page%20Recommendations/README.md)
    -   [1270.向公司 CEO 汇报工作的所有人](/database-solution/1200-1299/1270.All%20People%20Report%20to%20the%20Given%20Manager/README.md)
    -   [1280.学生们参加各科测试的次数](/database-solution/1200-1299/1280.Students%20and%20Examinations/README.md)
    -   [1285.找到连续区间的开始和结束数字](/database-solution/1200-1299/1285.Find%20the%20Start%20and%20End%20Number%20of%20Continuous%20Ranges/README.md)
    -   [1294.不同国家的天气类型](/database-solution/1200-1299/1294.Weather%20Type%20in%20Each%20Country/README.md)
    -   [1303.求团队人数](/database-solution/1300-1399/1303.Find%20the%20Team%20Size/README.md)
    -   [1308.不同性别每日分数总计](/database-solution/1300-1399/1308.Running%20Total%20for%20Different%20Genders/README.md)
    -   [1321.餐馆营业额变化增长](/database-solution/1300-1399/1321.Restaurant%20Growth/README.md)
    -   [1322.广告效果](/database-solution/1300-1399/1322.Ads%20Performance/README.md)
    -   [1327.列出指定时间段内所有的下单产品](/database-solution/1300-1399/1327.List%20the%20Products%20Ordered%20in%20a%20Period/README.md)
    -   [1336.每次访问的交易次数](/database-solution/1300-1399/1336.Number%20of%20Transactions%20per%20Visit/README.md)
    -   [1341.电影评分](/database-solution/1300-1399/1341.Movie%20Rating/README.md)
    -   [1350.院系无效的学生](/database-solution/1300-1399/1350.Students%20With%20Invalid%20Departments/README.md)
    -   [1355.活动参与者](/database-solution/1300-1399/1355.Activity%20Participants/README.md)
    -   [1364.顾客的可信联系人数量](/database-solution/1300-1399/1364.Number%20of%20Trusted%20Contacts%20of%20a%20Customer/README.md)
    -   [1369.获取最近第二次的活动](/database-solution/1300-1399/1369.Get%20the%20Second%20Most%20Recent%20Activity/README.md)
    -   [1378.使用唯一标识码替换员工 ID](/database-solution/1300-1399/1378.Replace%20Employee%20ID%20With%20The%20Unique%20Identifier/README.md)
    -   [1384.按年度列出销售总额](/database-solution/1300-1399/1384.Total%20Sales%20Amount%20by%20Year/README.md)
    -   [1393.股票的资本损益](/database-solution/1300-1399/1393.Capital%20GainLoss/README.md)
    -   [1398.购买了产品 A 和产品 B 却没有购买产品 C 的顾客](/database-solution/1300-1399/1398.Customers%20Who%20Bought%20Products%20A%20and%20B%20but%20Not%20C/README.md)
    -   [1407.排名靠前的旅行者](/database-solution/1400-1499/1407.Top%20Travellers/README.md)
    -   [1412.查找成绩处于中游的学生](/database-solution/1400-1499/1412.Find%20the%20Quiet%20Students%20in%20All%20Exams/README.md)
    -   [1421.净现值查询](/database-solution/1400-1499/1421.NPV%20Queries/README.md)
    -   [1435.制作会话柱状图](/database-solution/1400-1499/1435.Create%20a%20Session%20Bar%20Chart/README.md)
    -   [1440.计算布尔表达式的值](/database-solution/1400-1499/1440.Evaluate%20Boolean%20Expression/README.md)
    -   [1445.苹果和桔子](/database-solution/1400-1499/1445.Apples%20%26%20Oranges/README.md)
    -   [1454.活跃用户](/database-solution/1400-1499/1454.Active%20Users/README.md)
    -   [1459.矩形面积](/database-solution/1400-1499/1459.Rectangles%20Area/README.md)
    -   [1468.计算税后工资](/database-solution/1400-1499/1468.Calculate%20Salaries/README.md)
    -   [1479.周内每天的销售情况](/database-solution/1400-1499/1479.Sales%20by%20Day%20of%20the%20Week/README.md)
    -   [1484.按日期分组销售产品](/database-solution/1400-1499/1484.Group%20Sold%20Products%20By%20The%20Date/README.md)
    -   [1495.上月播放的儿童适宜电影](/database-solution/1400-1499/1495.Friendly%20Movies%20Streamed%20Last%20Month/README.md)
    -   [1501.可以放心投资的国家](/database-solution/1500-1599/1501.Countries%20You%20Can%20Safely%20Invest%20In/README.md)
    -   [1511.消费者下单频率](/database-solution/1500-1599/1511.Customer%20Order%20Frequency/README.md)
    -   [1517.查找拥有有效邮箱的用户](/database-solution/1500-1599/1517.Find%20Users%20With%20Valid%20E-Mails/README.md)
    -   [1527.患某种疾病的患者](/database-solution/1500-1599/1527.Patients%20With%20a%20Condition/README.md)
    -   [1532.最近的三笔订单](/database-solution/1500-1599/1532.The%20Most%20Recent%20Three%20Orders/README.md)
    -   [1543.产品名称格式修复](/database-solution/1500-1599/1543.Fix%20Product%20Name%20Format/README.md)
    -   [1549.每件商品的最新订单](/database-solution/1500-1599/1549.The%20Most%20Recent%20Orders%20for%20Each%20Product/README.md)
    -   [1555.银行账户概要](/database-solution/1500-1599/1555.Bank%20Account%20Summary/README.md)
    -   [1565.按月统计订单数与顾客数](/database-solution/1500-1599/1565.Unique%20Orders%20and%20Customers%20Per%20Month/README.md)
    -   [1571.仓库经理](/database-solution/1500-1599/1571.Warehouse%20Manager/README.md)
    -   [1581.进店却未进行过交易的顾客](/database-solution/1500-1599/1581.Customer%20Who%20Visited%20but%20Did%20Not%20Make%20Any%20Transactions/README.md)
    -   [1587.银行账户概要 II](/database-solution/1500-1599/1587.Bank%20Account%20Summary%20II/README.md)
    -   [1596.每位顾客最经常订购的商品](/database-solution/1500-1599/1596.The%20Most%20Frequently%20Ordered%20Products%20for%20Each%20Customer/README.md)
    -   [1607.没有卖出的卖家](/database-solution/1600-1699/1607.Sellers%20With%20No%20Sales/README.md)
    -   [1613.找到遗失的 ID](/database-solution/1600-1699/1613.Find%20the%20Missing%20IDs/README.md)
    -   [1623.三人国家代表队](/database-solution/1600-1699/1623.All%20Valid%20Triplets%20That%20Can%20Represent%20a%20Country/README.md)
    -   [1633.各赛事的用户注册率](/database-solution/1600-1699/1633.Percentage%20of%20Users%20Attended%20a%20Contest/README.md)
    -   [1635.Hopper 公司查询 I](/database-solution/1600-1699/1635.Hopper%20Company%20Queries%20I/README.md)
    -   [1645.Hopper 公司查询 II](/database-solution/1600-1699/1645.Hopper%20Company%20Queries%20II/README.md)
    -   [1651.Hopper 公司查询 III](/database-solution/1600-1699/1651.Hopper%20Company%20Queries%20III/README.md)
    -   [1661.每台机器的进程平均运行时间](/database-solution/1600-1699/1661.Average%20Time%20of%20Process%20per%20Machine/README.md)
    -   [1667.修复表中的名字](/database-solution/1600-1699/1667.Fix%20Names%20in%20a%20Table/README.md)
    -   [1677.发票中的产品金额](/database-solution/1600-1699/1677.Product%27s%20Worth%20Over%20Invoices/README.md)
    -   [1683.无效的推文](/database-solution/1600-1699/1683.Invalid%20Tweets/README.md)
    -   [1693.每天的领导和合伙人](/database-solution/1600-1699/1693.Daily%20Leads%20and%20Partners/README.md)
    -   [1699.两人之间的通话次数](/database-solution/1600-1699/1699.Number%20of%20Calls%20Between%20Two%20Persons/README.md)
    -   [1709.访问日期之间最大的空档期](/database-solution/1700-1799/1709.Biggest%20Window%20Between%20Visits/README.md)
    -   [1715.苹果和橘子的个数](/database-solution/1700-1799/1715.Count%20Apples%20and%20Oranges/README.md)
    -   [1729.求关注者的数量](/database-solution/1700-1799/1729.Find%20Followers%20Count/README.md)
    -   [1731.每位经理的下属员工数量](/database-solution/1700-1799/1731.The%20Number%20of%20Employees%20Which%20Report%20to%20Each%20Employee/README.md)
    -   [1741.查找每个员工花费的总时间](/database-solution/1700-1799/1741.Find%20Total%20Time%20Spent%20by%20Each%20Employee/README.md)
    -   [1747.应该被禁止的 Leetflex 账户](/database-solution/1700-1799/1747.Leetflex%20Banned%20Accounts/README.md)
    -   [1757.可回收且低脂的产品](/database-solution/1700-1799/1757.Recyclable%20and%20Low%20Fat%20Products/README.md)
    -   [1767.寻找没有被执行的任务对](/database-solution/1700-1799/1767.Find%20the%20Subtasks%20That%20Did%20Not%20Execute/README.md)
    -   [1777.每家商店的产品价格](/database-solution/1700-1799/1777.Product%27s%20Price%20for%20Each%20Store/README.md)
    -   [1783.大满贯数量](/database-solution/1700-1799/1783.Grand%20Slam%20Titles/README.md)
    -   [1789.员工的直属部门](/database-solution/1700-1799/1789.Primary%20Department%20for%20Each%20Employee/README.md)
    -   [1795.每个产品在不同商店的价格](/database-solution/1700-1799/1795.Rearrange%20Products%20Table/README.md)
    -   [1809.没有广告的剧集](/database-solution/1800-1899/1809.Ad-Free%20Sessions/README.md)
    -   [1811.寻找面试候选人](/database-solution/1800-1899/1811.Find%20Interview%20Candidates/README.md)
    -   [1821.寻找今年具有正收入的客户](/database-solution/1800-1899/1821.Find%20Customers%20With%20Positive%20Revenue%20this%20Year/README.md)
    -   [1831.每天的最大交易](/database-solution/1800-1899/1831.Maximum%20Transaction%20Each%20Day/README.md)
    -   [1841.联赛信息统计](/database-solution/1800-1899/1841.League%20Statistics/README.md)
    -   [1843.可疑银行账户](/database-solution/1800-1899/1843.Suspicious%20Bank%20Accounts/README.md)
    -   [1853.转换日期格式](/database-solution/1800-1899/1853.Convert%20Date%20Format/README.md)
    -   [1867.最大数量高于平均水平的订单](/database-solution/1800-1899/1867.Orders%20With%20Maximum%20Quantity%20Above%20Average/README.md)
    -   [1873.计算特殊奖金](/database-solution/1800-1899/1873.Calculate%20Special%20Bonus/README.md)
    -   [1875.将工资相同的雇员分组](/database-solution/1800-1899/1875.Group%20Employees%20of%20the%20Same%20Salary/README.md)
    -   [1890.2020 年最后一次登录](/database-solution/1800-1899/1890.The%20Latest%20Login%20in%202020/README.md)
    -   [1892.页面推荐 Ⅱ](/database-solution/1800-1899/1892.Page%20Recommendations%20II/README.md)
    -   [1907.按分类统计薪水](/database-solution/1900-1999/1907.Count%20Salary%20Categories/README.md)
    -   [1917.Leetcodify 好友推荐](/database-solution/1900-1999/1917.Leetcodify%20Friends%20Recommendations/README.md)
    -   [1919.兴趣相同的朋友](/database-solution/1900-1999/1919.Leetcodify%20Similar%20Friends/README.md)
    -   [1934.确认率](/database-solution/1900-1999/1934.Confirmation%20Rate/README.md)
    -   [1939.主动请求确认消息的用户](/database-solution/1900-1999/1939.Users%20That%20Actively%20Request%20Confirmation%20Messages/README.md)
    -   [1949.坚定的友谊](/database-solution/1900-1999/1949.Strong%20Friendship/README.md)
    -   [1951.查询具有最多共同关注者的所有两两结对组](/database-solution/1900-1999/1951.All%20the%20Pairs%20With%20the%20Maximum%20Number%20of%20Common%20Followers/README.md)
    -   [1965.丢失信息的雇员](/database-solution/1900-1999/1965.Employees%20With%20Missing%20Information/README.md)
    -   [1972.同一天的第一个电话和最后一个电话](/database-solution/1900-1999/1972.First%20and%20Last%20Call%20On%20the%20Same%20Day/README.md)
    -   [1978.上级经理已离职的公司员工](/database-solution/1900-1999/1978.Employees%20Whose%20Manager%20Left%20the%20Company/README.md)
    -   [1988.找出每所学校的最低分数要求](/database-solution/1900-1999/1988.Find%20Cutoff%20Score%20for%20Each%20School/README.md)
    -   [1990.统计实验的数量](/database-solution/1900-1999/1990.Count%20the%20Number%20of%20Experiments/README.md)
    -   [2004.职员招聘人数](/database-solution/2000-2099/2004.The%20Number%20of%20Seniors%20and%20Juniors%20to%20Join%20the%20Company/README.md)
    -   [2010.职员招聘人数 II](/database-solution/2000-2099/2010.The%20Number%20of%20Seniors%20and%20Juniors%20to%20Join%20the%20Company%20II/README.md)
    -   [2020.无流量的帐户数](/database-solution/2000-2099/2020.Number%20of%20Accounts%20That%20Did%20Not%20Stream/README.md)
    -   [2026.低质量的问题](/database-solution/2000-2099/2026.Low-Quality%20Problems/README.md)
    -   [2041.面试中被录取的候选人](/database-solution/2000-2099/2041.Accepted%20Candidates%20From%20the%20Interviews/README.md)
    -   [2051.商店中每个成员的级别](/database-solution/2000-2099/2051.The%20Category%20of%20Each%20Member%20in%20the%20Store/README.md)
    -   [2066.账户余额](/database-solution/2000-2099/2066.Account%20Balance/README.md)
    -   [2072.赢得比赛的大学](/database-solution/2000-2099/2072.The%20Winner%20University/README.md)
    -   [2082.富有客户的数量](/database-solution/2000-2099/2082.The%20Number%20of%20Rich%20Customers/README.md)
    -   [2084.为订单类型为 0 的客户删除类型为 1 的订单](/database-solution/2000-2099/2084.Drop%20Type%201%20Orders%20for%20Customers%20With%20Type%200%20Orders/README.md)
    -   [2112.最繁忙的机场](/database-solution/2100-2199/2112.The%20Airport%20With%20the%20Most%20Traffic/README.md)
    -   [2118.建立方程](/database-solution/2100-2199/2118.Build%20the%20Equation/README.md)
    -   [2142.每辆车的乘客人数 I](/database-solution/2100-2199/2142.The%20Number%20of%20Passengers%20in%20Each%20Bus%20I/README.md)
    -   [2153.每辆车的乘客人数 II](/database-solution/2100-2199/2153.The%20Number%20of%20Passengers%20in%20Each%20Bus%20II/README.md)
    -   [2159.分别排序两列](/database-solution/2100-2199/2159.Order%20Two%20Columns%20Independently/README.md)
    -   [2173.最多连胜的次数](/database-solution/2100-2199/2173.Longest%20Winning%20Streak/README.md)
    -   [2175.世界排名的变化](/database-solution/2100-2199/2175.The%20Change%20in%20Global%20Rankings/README.md)
    -   [2199.找到每篇文章的主题](/database-solution/2100-2199/2199.Finding%20the%20Topic%20of%20Each%20Post/README.md)
    -   [2205.有资格享受折扣的用户数量](/database-solution/2200-2299/2205.The%20Number%20of%20Users%20That%20Are%20Eligible%20for%20Discount/README.md)
    -   [2228.7 天内两次购买的用户](/database-solution/2200-2299/2228.Users%20With%20Two%20Purchases%20Within%20Seven%20Days/README.md)
    -   [2230.查找可享受优惠的用户](/database-solution/2200-2299/2230.The%20Users%20That%20Are%20Eligible%20for%20Discount/README.md)
    -   [2238.司机成为乘客的次数](/database-solution/2200-2299/2238.Number%20of%20Times%20a%20Driver%20Was%20a%20Passenger/README.md)
    -   [2252.表的动态旋转](/database-solution/2200-2299/2252.Dynamic%20Pivoting%20of%20a%20Table/README.md)
    -   [2253.动态取消表的旋转](/database-solution/2200-2299/2253.Dynamic%20Unpivoting%20of%20a%20Table/README.md)
    -   [2292.连续两年有 3 个及以上订单的产品](/database-solution/2200-2299/2292.Products%20With%20Three%20or%20More%20Orders%20in%20Two%20Consecutive%20Years/README.md)
    -   [2298.周末任务计数](/database-solution/2200-2299/2298.Tasks%20Count%20in%20the%20Weekend/README.md)
    -   [2308.按性别排列表格](/database-solution/2300-2399/2308.Arrange%20Table%20by%20Gender/README.md)
    -   [2314.每个城市最高气温的第一天](/database-solution/2300-2399/2314.The%20First%20Day%20of%20the%20Maximum%20Recorded%20Degree%20in%20Each%20City/README.md)
    -   [2324.产品销售分析 IV](/database-solution/2300-2399/2324.Product%20Sales%20Analysis%20IV/README.md)
    -   [2329.产品销售分析 Ⅴ](/database-solution/2300-2399/2329.Product%20Sales%20Analysis%20V/README.md)
    -   [2339.联赛的所有比赛](/database-solution/2300-2399/2339.All%20the%20Matches%20of%20the%20League/README.md)
    -   [2346.以百分比计算排名](/database-solution/2300-2399/2346.Compute%20the%20Rank%20as%20a%20Percentage/README.md)
    -   [2356.每位教师所教授的科目种类的数量](/database-solution/2300-2399/2356.Number%20of%20Unique%20Subjects%20Taught%20by%20Each%20Teacher/README.md)
    -   [2362.生成发票](/database-solution/2300-2399/2362.Generate%20the%20Invoice/README.md)
    -   [2372.计算每个销售人员的影响力](/database-solution/2300-2399/2372.Calculate%20the%20Influence%20of%20Each%20Salesperson/README.md)
    -   [2377.整理奥运表](/database-solution/2300-2399/2377.Sort%20the%20Olympic%20Table/README.md)
    -   [2388.将表中的空值更改为前一个值](/database-solution/2300-2399/2388.Change%20Null%20Values%20in%20a%20Table%20to%20the%20Previous%20Value/README.md)
    -   [2394.开除员工](/database-solution/2300-2399/2394.Employees%20With%20Deductions/README.md)
    -   [2474.购买量严格增加的客户](/database-solution/2400-2499/2474.Customers%20With%20Strictly%20Increasing%20Purchases/README.md)
    -   [2480.形成化学键](/database-solution/2400-2499/2480.Form%20a%20Chemical%20Bond/README.md)
    -   [2494.合并在同一个大厅重叠的活动](/database-solution/2400-2499/2494.Merge%20Overlapping%20Events%20in%20the%20Same%20Hall/README.md)
    -   [2504.把名字和职业联系起来](/database-solution/2500-2599/2504.Concatenate%20the%20Name%20and%20the%20Profession/README.md)
    -   [2668.查询员工当前薪水](/database-solution/2600-2699/2668.Find%20Latest%20Salaries/README.md)
    -   [2669.统计 Spotify 排行榜上艺术家出现次数](/database-solution/2600-2699/2669.Count%20Artist%20Occurrences%20On%20Spotify%20Ranking%20List/README.md)
    -   [2686.即时食物配送 III](/database-solution/2600-2699/2686.Immediate%20Food%20Delivery%20III/README.md)
    -   [2687.自行车的最后使用时间](/database-solution/2600-2699/2687.Bikes%20Last%20Time%20Used/README.md)
    -   [2688.查找活跃用户](/database-solution/2600-2699/2688.Find%20Active%20Users/README.md)
    -   [2701.连续递增交易](/database-solution/2700-2799/2701.Consecutive%20Transactions%20with%20Increasing%20Amounts/README.md)
    -   [2720.受欢迎度百分比](/database-solution/2700-2799/2720.Popularity%20Percentage/README.md)
    -   [2738.统计文本中单词的出现次数](/database-solution/2700-2799/2738.Count%20Occurrences%20in%20Text/README.md)
    -   [2752.在连续天数上进行了最多交易次数的顾客](/database-solution/2700-2799/2752.Customers%20with%20Maximum%20Number%20of%20Transactions%20on%20Consecutive%20Days/README.md)
    -   [2783.航班入座率和等待名单分析](/database-solution/2700-2799/2783.Flight%20Occupancy%20and%20Waitlist%20Analysis/README.md)
    -   [2793.航班机票状态](/database-solution/2700-2799/2793.Status%20of%20Flight%20Tickets/README.md)
    -   [2820.选举结果](/database-solution/2800-2899/2820.Election%20Results/README.md)
    -   [2837.总旅行距离](/database-solution/2800-2899/2837.Total%20Traveled%20Distance/README.md)
    -   [2853.最高薪水差异](/database-solution/2800-2899/2853.Highest%20Salaries%20Difference/README.md)
    -   [2854.滚动平均步数](/database-solution/2800-2899/2854.Rolling%20Average%20Steps/README.md)
    -   [2893.Calculate Orders Within Each Interval](/database-solution/2800-2899/2893.Calculate%20Orders%20Within%20Each%20Interval/README.md)