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Author: assassint2017

Big Countries/Big_Countries.sql

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+# Runtime: 196 ms, faster than 100.00% of MySQL online submissions for Big Countries.
+# Write your MySQL query statement below
+SELECT name, population,area
+FROM World
+WHERE population > 25000000 OR area > 3000000;

Classes More Than 5 Students/Classes_More_Than_5_Students.sql

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+# Write your MySQL query statement below
+# Runtime: 188 ms, faster than 100.00% of MySQL online submissions for Classes More Than 5 Students.
+select class from courses group by class having count(distinct student) >= 5;

Combine Two Tables/Combine_Two_Tables.sql

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-# Write your MySQL query statement below
+-- Write your MySQL query statement below
+-- Runtime: 276 ms, faster than 6.52% of MySQL online submissions for Combine Two Tables.
 select t1.FirstName, t1.LastName, t2.City, t2.State
 from Person t1
 left outer join Address t2

Customers Who Never Order/Customers_Who_Never_Order.sql

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+# Write your MySQL query statement below
+# Runtime: 261 ms, faster than 40.78% of MySQL online submissions for Customers Who Never Order.
+
+SELECT Name as Customers
+FROM Customers
+WHERE id NOT IN
+(
+SELECT t1.id
+FROM Customers t1
+INNER JOIN Orders t2
+ON t1.Id = t2.CustomerId
+);

Delete Duplicate Emails/Delete_Duplicate_Emails.sql

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+# Write your MySQL query statement below
+# Runtime: 544 ms, faster than 92.21% of MySQL online submissions for Delete Duplicate Emails.
+delete from Person where Id not in
+(
+    select temp.Id
+    From
+    (
+        select MIN(Id) as Id
+        FROM Person
+        GROUP BY Email        
+    )
+    as temp
+);

Duplicate Emails/Duplicate_Emails.sql

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+# Write your MySQL query statement below
+# Runtime: 206 ms, faster than 29.08% of MySQL online submissions for Duplicate Emails.
+select Email from Person group by Email having count(distinct Id) > 1;

Employees Earning More Than Their Managers/Employees_Earning_More_Than_Their_Managers.sql

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+# Write your MySQL query statement below
+# Runtime: 302 ms, faster than 51.16% of MySQL online submissions for Employees Earning More Than Their Managers.
+SELECT t1.Name AS Employee
+FROM Employee t1, Employee t2
+WHERE t1.ManagerId = t2.Id AND t1.Salary > t2.Salary;

Not Boring Movies/Not_Boring_Movies.sql

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+# Write your MySQL query statement below
+# Runtime: 118 ms, faster than 97.65% of MySQL online submissions for Not Boring Movies.
+SELECT * 
+FROM cinema
+WHERE id MOD 2 = 1 AND description <> 'boring'
+ORDER BY rating DESC;

Swap Salary/Swap_Salary.sql

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+# Write your MySQL query statement below
+# Runtime: 142 ms, faster than 100.00% of MySQL online submissions for Swap Salary.
+-- 按理说第一条语句就可以，但是没有结果，应该是网站出现了一些bug
+# UPDATE salary SET sex = IF (sex = 'm', 'f', 'm')
+SELECT id, name, IF (sex = 'm', 'f', 'm') as sex, salary
+FROM salary;