├── Basics ├── 1050_Actors_and_Directors_Who_Cooperated_At_Least_Three_Times.sql ├── 1069_Product_Sales_Analysis_II.sql ├── 1076_Project_Employees_II.sql ├── 1082_Sales_Analysis_I.sql ├── 1141_User_Activity_for_the_Past_30_Days_I.sql ├── 1148_Article_Views_I.sql ├── 1149_Article_Views_II.sql ├── 182_Duplicate_Emails.sql ├── 511_Game_Play_Analysis_I.sql ├── 578_Get_Highest_Answer_Rate_Question.sql ├── 584_Find_Customer_Referee.sql ├── 586_Customer_Placing_the_Largest_Number_of_Orders.sql ├── 595_Big_Countries.sql ├── 596_Classes_More_Than_5_Students.sql ├── 619_Biggest_Single_Number.sql └── 620_Not_Boring_Movies.sql ├── CASE-WHEN ├── 1126_Active_Businesses.sql ├── 1142_User_Activity_for_the_Past_30_Days_II.sql ├── 1158_Market_Analysis_I.sql ├── 1159_Market_Analysis_II.sql ├── 1173_Immediate_Food_Delivery_I.sql ├── 1174_Immediate_Food_Delivery_II.sql ├── 1193_Monthly_Transactions_I.sql ├── 1194_Tournament_Winners.sql ├── 1211_Queries_Quality_and_Percentage.sql ├── 1212_Team_Scores_in_Football_Tournament.sql ├── 1264_Page_Recommendations.sql ├── 1294_Weather_Type_in_Each_Country.sql ├── 1322_Ads_Performance.sql ├── 1393_Capital_Gain_Loss.sql ├── 1398_Customers_Who_Bought_Products_A_and_B_but_Not_C.sql ├── 262_Trips_and_Users.sql ├── 597_Friend_Requests_I_Overall_Acceptance_Rate.sql ├── 608_Tree_Node.sql ├── 610_Triangle_Judgement.sql ├── 615_Average_Salary_Departments_VS_Company.sql ├── 618_Students_Report_By_Geography.sql ├── 626_Exchange_Seats.sql └── 627_Swap_Salary.sql ├── Join ├── Advanced-Join │ ├── 1097_Game_Play_Analysis_V.sql │ ├── 1126_Active_Businesses.sql │ ├── 1127_User_Purchase_Platform.sql │ ├── 1159_Market_Analysis_II.sql │ ├── 1194_Tournament_Winners.sql │ ├── 1212_Team_Scores_in_Football_Tournament.sql │ ├── 1225_Report_Contiguous_Dates.sql │ ├── 1251_Average_Selling_Price.sql │ ├── 1285_Find_the_Start_and_End_Number_of_Continuous_Ranges.sql │ ├── 1308_Running_Total_for_Different_Genders.sql │ ├── 1321_Restaurant_Growth.sql │ ├── 1369_Get_the_Second_Most_Recent_Activity.sql │ ├── 180_Consecutive_Numbers.sql │ ├── 196_Delete_Duplicate_Emails.sql │ ├── 534_Game_Play_Analysis_III.sql │ ├── 569_Median_Employee_Salary.sql │ ├── 579_Find_Cumulative_Salary_of_an_Employee.sql │ ├── 601_Human_Traffic_of_Stadium.sql │ ├── 603_Consecutive_Available_Seats.sql │ ├── 612_Shortest_Distance_in_a_Plane.sql │ └── 613_Shortest_Distance_in_a_Line.sql ├── Join.md └── Simple-Join │ ├── 1068_Product_Sales_Analysis_I.sql │ ├── 1070_Product_Sales_Analysis_III.sql │ ├── 1075_Project_Employees_I.sql │ ├── 1077_Project_Employees_III.sql │ ├── 1083_Sales_Analysis_II.sql │ ├── 1112_Highest_Grade_For_Each_Student.sql │ ├── 1132_Reported_Posts_II.sql │ ├── 1158_Market_Analysis_I.sql │ ├── 1164_Product_Price_at_a_Given_Date.sql │ ├── 1204_Last_Person_to_Fit_in_the_Elevator.sql │ ├── 1205_Monthly_Transactions_II.sql │ ├── 1241_Number_of_Comments_per_Post.sql │ ├── 1270_All_People_Report_to_the_Given_Manager.sql │ ├── 1280_Students_and_Examinations.sql │ ├── 1294_Weather_Type_in_Each_Country.sql │ ├── 1303_Find_the_Team_Size.sql │ ├── 1327_List_the_Products_Ordered_in_a_Period.sql │ ├── 1336_Number_of_Transactions_per_Visit.sql │ ├── 1350_Students_With_Invalid_Departments.sql │ ├── 1364_Number_of_Trusted_Contacts_of_a_Customer.sql │ ├── 1378_Replace_Employee_ID_With_The_Unique_Identifier.sql │ ├── 1384_Total_Sales_Amount_by_Year.sql │ ├── 1407_Top_Travellers.sql │ ├── 175_Combine_Two_Tables.sql │ ├── 181_Employees_Earning_More_Than_Their_Managers.sql │ ├── 183_Customers_Who_Never_Order.sql │ ├── 184_Department_Highest_Salary.sql │ ├── 197_Rising_Temperature.sql │ ├── 262_Trips_and_Users.sql │ ├── 512_Game_Play_Analysis_II.sql │ ├── 550_Game_Play_Analysis_IV.sql │ ├── 570_Managers_with_at_Least_5_Direct_Reports.sql │ ├── 574_Winning_Candidate.sql │ ├── 577_Employee_Bonus.sql │ ├── 580_Count_Student_Number_in_Departments.sql │ ├── 607_Sales_Person.sql │ ├── 614_Second_Degree_Follower.sql │ └── 615_Average_Salary_Departments_VS_Company.sql ├── OFFSET-FETCH ├── 1321_Restaurant_Growth.sql ├── 176_Second_Highest_Salary.sql ├── 177_Nth_Highest_Salary.sql └── OFFSET-FETCH.md ├── PIVOT-UNPIVOT ├── 1179_Reformat_Department_Table.sql ├── 1322_Ads_Performance.sql ├── 602_Friend_Requests_II_Who_Has_the_Most_Friends.sql └── 618_Students_Report_By_Geography.sql ├── Questions_by_ID ├── 1045_Customers_Who_Bought_All_Products.sql ├── 1050_Actors_and_Directors_Who_Cooperated_At_Least_Three_Times.sql ├── 1068_Product_Sales_Analysis_I.sql ├── 1069_Product_Sales_Analysis_II.sql ├── 1070_Product_Sales_Analysis_III.sql ├── 1075_Project_Employees_I.sql ├── 1076_Project_Employees_II.sql ├── 1077_Project_Employees_III.sql ├── 1082_Sales_Analysis_I.sql ├── 1083_Sales_Analysis_II.sql ├── 1084_Sales_Analysis_III.sql ├── 1097_Game_Play_Analysis_V.sql ├── 1098_Unpopular_Books.sql ├── 1107_New_Users_Daily_Count.sql ├── 1112_Highest_Grade_For_Each_Student.sql ├── 1113_Reported_Posts.sql ├── 1126_Active_Businesses.sql ├── 1127_User_Purchase_Platform.sql ├── 1132_Reported_Posts_II.sql ├── 1141_User_Activity_for_the_Past_30_Days_I.sql ├── 1142_User_Activity_for_the_Past_30_Days_II.sql ├── 1148_Article_Views_I.sql ├── 1149_Article_Views_II.sql ├── 1158_Market_Analysis_I.sql ├── 1159_Market_Analysis_II.sql ├── 1164_Product_Price_at_a_Given_Date.sql ├── 1173_Immediate_Food_Delivery_I.sql ├── 1174_Immediate_Food_Delivery_II.sql ├── 1179_Reformat_Department_Table.sql ├── 1193_Monthly_Transactions_I.sql ├── 1194_Tournament_Winners.sql ├── 1204_Last_Person_to_Fit_in_the_Elevator.sql ├── 1205_Monthly_Transactions_II.sql ├── 1211_Queries_Quality_and_Percentage.sql ├── 1212_Team_Scores_in_Football_Tournament.sql ├── 1225_Report_Contiguous_Dates.sql ├── 1241_Number_of_Comments_per_Post.sql ├── 1251_Average_Selling_Price.sql ├── 1264_Page_Recommendations.sql ├── 1270_All_People_Report_to_the_Given_Manager.sql ├── 1280_Students_and_Examinations.sql ├── 1285_Find_the_Start_and_End_Number_of_Continuous_Ranges.sql ├── 1294_Weather_Type_in_Each_Country.sql ├── 1303_Find_the_Team_Size.sql ├── 1308_Running_Total_for_Different_Genders.sql ├── 1321_Restaurant_Growth.sql ├── 1322_Ads_Performance.sql ├── 1327_List_the_Products_Ordered_in_a_Period.sql ├── 1336_Number_of_Transactions_per_Visit.sql ├── 1341_Movie_Rating.sql ├── 1350_Students_With_Invalid_Departments.sql ├── 1355_Activity_Participants.sql ├── 1364_Number_of_Trusted_Contacts_of_a_Customer.sql ├── 1369_Get_the_Second_Most_Recent_Activity.sql ├── 1378_Replace_Employee_ID_With_The_Unique_Identifier.sql ├── 1384_Total_Sales_Amount_by_Year.sql ├── 1393_Capital_Gain_Loss.sql ├── 1398_Customers_Who_Bought_Products_A_and_B_but_Not_C.sql ├── 1407_Top_Travellers.sql ├── 1412_Find_The_Quiet_Students_in_All_Exams.sql ├── 175_Combine_Two_Tables.sql ├── 176_Second_Highest_Salary.sql ├── 177_Nth_Highest_Salary.sql ├── 178_Rank_Scores.sql ├── 180_Consecutive_Numbers.sql ├── 181_Employees_Earning_More_Than_Their_Managers.sql ├── 182_Duplicate_Emails.sql ├── 183_Customers_Who_Never_Order.sql ├── 184_Department_Highest_Salary.sql ├── 185_Department_Top_Three_Salaries.sql ├── 196_Delete_Duplicate_Emails.sql ├── 197_Rising_Temperature.sql ├── 262_Trips_and_Users.sql ├── 511_Game_Play_Analysis_I.sql ├── 512_Game_Play_Analysis_II.sql ├── 534_Game_Play_Analysis_III.sql ├── 550_Game_Play_Analysis_IV.sql ├── 569_Median_Employee_Salary.sql ├── 570_Managers_with_at_Least_5_Direct_Reports.sql ├── 571_Find_Median_Given_Frequency_of_Numbers.sql ├── 574_Winning_Candidate.sql ├── 577_Employee_Bonus.sql ├── 578_Get_Highest_Answer_Rate_Question.sql ├── 579_Find_Cumulative_Salary_of_an_Employee.sql ├── 580_Count_Student_Number_in_Departments.sql ├── 584_Find_Customer_Referee.sql ├── 585_Investments_in_2016.sql ├── 586_Customer_Placing_the_Largest_Number_of_Orders.sql ├── 595_Big_Countries.sql ├── 596_Classes_More_Than_5_Students.sql ├── 597_Friend_Requests_I_Overall_Acceptance_Rate.sql ├── 601_Human_Traffic_of_Stadium.sql ├── 602_Friend_Requests_II_Who_Has_the_Most_Friends.sql ├── 603_Consecutive_Available_Seats.sql ├── 607_Sales_Person.sql ├── 608_Tree_Node.sql ├── 610_Triangle_Judgement.sql ├── 612_Shortest_Distance_in_a_Plane.sql ├── 613_Shortest_Distance_in_a_Line.sql ├── 614_Second_Degree_Follower.sql ├── 615_Average_Salary_Departments_VS_Company.sql ├── 618_Students_Report_By_Geography.sql ├── 619_Biggest_Single_Number.sql ├── 620_Not_Boring_Movies.sql ├── 626_Exchange_Seats.sql └── 627_Swap_Salary.sql ├── Readme.md ├── SQL-Command ├── 196_Delete_Duplicate_Emails.sql └── 627_Swap_Salary.sql ├── Subquery ├── Advanced-Subquery │ ├── 1077_Project_Employees_III.sql │ ├── 1127_User_Purchase_Platform.sql │ ├── 1159_Market_Analysis_II.sql │ ├── 1164_Product_Price_at_a_Given_Date.sql │ ├── 1194_Tournament_Winners.sql │ ├── 1205_Monthly_Transactions_II.sql │ ├── 1270_All_People_Report_to_the_Given_Manager.sql │ ├── 1398_Customers_Who_Bought_Products_A_and_B_but_Not_C.sql │ ├── 262_Trips_and_Users.sql │ ├── 550_Game_Play_Analysis_IV.sql │ ├── 569_Median_Employee_Salary.sql │ ├── 585_Investments_in_2016.sql │ ├── 597_Friend_Requests_I_Overall_Acceptance_Rate.sql │ └── 601_Human_Traffic_of_Stadium.sql ├── Recursive-CTE │ ├── 1270_All_People_Report_to_the_Given_Manager.sql │ ├── 1336_Number_of_Transactions_per_Visit.sql │ └── 1384_Total_Sales_Amount_by_Year.sql ├── Simple-Subquery │ ├── 1045_Customers_Who_Bought_All_Products.sql │ ├── 1070_Product_Sales_Analysis_III.sql │ ├── 1083_Sales_Analysis_II.sql │ ├── 1084_Sales_Analysis_III.sql │ ├── 1097_Game_Play_Analysis_V.sql │ ├── 1098_Unpopular_Books.sql │ ├── 1107_New_Users_Daily_Count.sql │ ├── 1112_Highest_Grade_For_Each_Student.sql │ ├── 1126_Active_Businesses.sql │ ├── 1132_Reported_Posts_II.sql │ ├── 1142_User_Activity_for_the_Past_30_Days_II.sql │ ├── 1158_Market_Analysis_I.sql │ ├── 1174_Immediate_Food_Delivery_II.sql │ ├── 1204_Last_Person_to_Fit_in_the_Elevator.sql │ ├── 1225_Report_Contiguous_Dates.sql │ ├── 1264_Page_Recommendations.sql │ ├── 1280_Students_and_Examinations.sql │ ├── 1285_Find_the_Start_and_End_Number_of_Continuous_Ranges.sql │ ├── 1294_Weather_Type_in_Each_Country.sql │ ├── 1321_Restaurant_Growth.sql │ ├── 1322_Ads_Performance.sql │ ├── 1336_Number_of_Transactions_per_Visit.sql │ ├── 1341_Movie_Rating.sql │ ├── 1350_Students_With_Invalid_Departments.sql │ ├── 1355_Activity_Participants.sql │ ├── 1364_Number_of_Trusted_Contacts_of_a_Customer.sql │ ├── 1369_Get_the_Second_Most_Recent_Activity.sql │ ├── 176_Second_Highest_Salary.sql │ ├── 183_Customers_Who_Never_Order.sql │ ├── 184_Department_Highest_Salary.sql │ ├── 196_Delete_Duplicate_Emails.sql │ ├── 197_Rising_Temperature.sql │ ├── 512_Game_Play_Analysis_II.sql │ ├── 569_Median_Employee_Salary.sql │ ├── 570_Managers_with_at_Least_5_Direct_Reports.sql │ ├── 571_Find_Median_Given_Frequency_of_Numbers.sql │ ├── 574_Winning_Candidate.sql │ ├── 579_Find_Cumulative_Salary_of_an_Employee.sql │ ├── 580_Count_Student_Number_in_Departments.sql │ ├── 602_Friend_Requests_II_Who_Has_the_Most_Friends.sql │ ├── 603_Consecutive_Available_Seats.sql │ ├── 607_Sales_Person.sql │ ├── 608_Tree_Node.sql │ ├── 613_Shortest_Distance_in_a_Line.sql │ ├── 614_Second_Degree_Follower.sql │ ├── 615_Average_Salary_Departments_VS_Company.sql │ ├── 618_Students_Report_By_Geography.sql │ └── 626_Exchange_Seats.sql └── Subquery.md ├── Variable ├── 1098_Unpopular_Books.sql ├── 1107_New_Users_Daily_Count.sql ├── 1113_Reported_Posts.sql └── 597_Friend_Requests_I_Overall_Acceptance_Rate.sql └── Window-Function ├── 1070_Product_Sales_Analysis_III.sql ├── 1077_Project_Employees_III.sql ├── 1107_New_Users_Daily_Count.sql ├── 1112_Highest_Grade_For_Each_Student.sql ├── 1126_Active_Businesses.sql ├── 1127_User_Purchase_Platform.sql ├── 1159_Market_Analysis_II.sql ├── 1164_Product_Price_at_a_Given_Date.sql ├── 1174_Immediate_Food_Delivery_II.sql ├── 1194_Tournament_Winners.sql ├── 1204_Last_Person_to_Fit_in_the_Elevator.sql ├── 1225_Report_Contiguous_Dates.sql ├── 1285_Find_the_Start_and_End_Number_of_Continuous_Ranges.sql ├── 1303_Find_the_Team_Size.sql ├── 1308_Running_Total_for_Different_Genders.sql ├── 1321_Restaurant_Growth.sql ├── 1355_Activity_Participants.sql ├── 1369_Get_the_Second_Most_Recent_Activity.sql ├── 1412_Find_The_Quiet_Students_in_All_Exams.sql ├── 176_Second_Highest_Salary.sql ├── 177_Nth_Highest_Salary.sql ├── 178_Rank_Scores.sql ├── 180_Consecutive_Numbers.sql ├── 184_Department_Highest_Salary.sql ├── 185_Department_Top_Three_Salaries.sql ├── 197_Rising_Temperature.sql ├── 512_Game_Play_Analysis_II.sql ├── 534_Game_Play_Analysis_III.sql ├── 550_Game_Play_Analysis_IV.sql ├── 569_Median_Employee_Salary.sql ├── 571_Find_Median_Given_Frequency_of_Numbers.sql ├── 579_Find_Cumulative_Salary_of_an_Employee.sql ├── 585_Investments_in_2016.sql ├── 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