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Author: A-Hemeda

ADVANCE JOIN/Placements.sql

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+Select S.Name
+from Students S inner join Friends f
+on S.ID = f.ID
+inner join Packages p
+on f.ID = p.ID
+inner join Packages fp
+on f.Friend_ID = fp.ID
+where fp.Salary > p.Salary
+order by fp.Salary;

ADVANCE JOIN/SQL PROJECT PLANNING.sql

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+-- Author: @bratinkanrar
+SELECT s.Proj_Start_Date, min(e.Proj_End_Date) as Real_Proj_End_Date 
+FROM
+(SELECT Start_Date as Proj_Start_Date FROM Projects WHERE Start_Date NOT IN (SELECT End_Date FROM Projects)) s,
+(SELECT End_Date as Proj_End_Date FROM Projects WHERE End_Date NOT IN (SELECT Start_Date FROM Projects)) e
+WHERE s.Proj_Start_Date < e.Proj_End_Date
+GROUP BY s.Proj_Start_Date
+ORDER BY DATEDIFF(min(e.Proj_End_Date), s.Proj_Start_Date) ASC, s.Proj_Start_Date ASC;

Advanced Select/Binary Tree Nodes.sql

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+# Author: Thomas George Thomas
+SELECT BT.N,
+CASE
+    WHEN BT.P IS NULL THEN 'Root'
+    WHEN EXISTS (SELECT B.P FROM BST B WHERE B.P = BT.N) THEN 'Inner'        
+    ELSE 'Leaf'
+END
+FROM BST AS BT 
+ORDER BY BT.N

Advanced Select/New Companies.sql

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+# Author: Thomas George Thomas
+SELECT c.company_code,c.founder,
+count(distinct lm.lead_manager_code),
+count(distinct sm.senior_manager_code),
+count(distinct m.manager_code), 
+count(distinct e.employee_code)
+FROM Company c, Lead_Manager lm, Senior_Manager sm, Manager m, Employee e
+WHERE
+c.company_code=lm.company_code AND
+lm.lead_manager_code=sm.lead_manager_code AND
+sm.senior_manager_code=m.senior_manager_code AND
+m.manager_code=e.manager_code
+GROUP BY c.company_code,c.founder
+ORDER BY c.company_code ASC

Advanced Select/Occupations.sql

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+-- Contributor: Abhishek Srivastava
+SELECT 
+    MAX(CASE WHEN Occupation = 'Doctor' THEN Name END) AS Doctor,
+    MAX(CASE WHEN Occupation = 'Professor' THEN Name END) AS Professor,
+    MAX(CASE WHEN Occupation = 'Singer' THEN Name END) AS Singer,
+    MAX(CASE WHEN Occupation = 'Actor' THEN Name END) AS Actor
+FROM (
+    SELECT 
+        Name,
+        Occupation,
+        ROW_NUMBER() OVER (PARTITION BY Occupation ORDER BY Name) AS rn
+    FROM OCCUPATIONS
+) AS sub
+GROUP BY rn;
+

Advanced Select/The PADS.sql

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+# Author: Thomas George Thomas
+select concat(name,'(',substring(Occupation,1,1),')') as Name 
+from occupations 
+order by Name;
+Select concat ('There are a total of ', count(occupation),' ', lower(occupation),'s.') as totals
+from occupations
+group by occupation
+order by totals

Advanced Select/Type of Triangle.sql

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+# Author: Thomas George Thomas
+Select 
+CASE
+when A + B <= C or A + C <= B or B + C <= A then "Not A Triangle"
+when A = B and B = C then "Equilateral"
+when A = B or A = C or B = C then "Isosceles"
+else "Scalene"
+end as triangle_sides
+from TRIANGLES

Aggregation/Average Population.sql

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+# Author: Thomas George Thomas
+SELECT FLOOR(AVG(POPULATION))
+FROM CITY

Aggregation/Japan Population.sql

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+# Author: Thomas George Thomas
+SELECT SUM(POPULATION)
+FROM CITY
+WHERE COUNTRYCODE ='JPN'

Aggregation/Population Density Difference.sql

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+# Author: Thomas George Thomas
+SELECT MAX(POPULATION) - MIN(POPULATION)
+FROM CITY