Section 05 : Advanced Select and Joins - part 01

Author: Farahat612

2. Basic Joins/09 Code Testcase Test Result Test Result 1934. Confirmation Rate.sql renamed to 2. Basic Joins/09 1934. Confirmation Rate.sql

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+SELECT a.employee_id, a.name, COUNT(*) AS reports_count, ROUND(AVG(b.age)) AS average_age
+FROM Employees a, Employees b
+WHERE a.employee_id = b.reports_to
+GROUP BY 1
+ORDER BY 1

3. Basic Aggregate Functions/01 Code Testcase Test Result Test Result 620. Not Boring Movies.sql renamed to 3. Basic Aggregate Functions/01 620. Not Boring Movies.sql

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+SELECT DISTINCT employee_id, department_id
+FROM Employee 
+WHERE employee_id IN
+    (
+    SELECT employee_id
+    FROM Employee
+    GROUP BY 1
+    HAVING COUNT(*) = 1
+    )
+    OR primary_flag = 'Y'
+ORDER BY 1

4. Sorting and Grouping/06 Code Testcase Test Result Test Result 619. Biggest Single Number.sql renamed to 4. Sorting and Grouping/06 619. Biggest Single Number.sql

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+SELECT x, y, z,
+  CASE WHEN (x + y <= z OR y + z <= x OR x + z <= y) THEN 'No' ELSE 'Yes' END AS triangle
+FROM Triangle;

5. Advanced Select and Joins/01 1731. The Number of Employees Which Report to Each Employee.sql

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+SELECT DISTINCT l1.Num AS ConsecutiveNums
+FROM Logs l1, Logs l2, Logs l3
+WHERE l1.Id = l2.Id - 1 AND l2.Id = l3.Id - 1 AND l1.Num = l2.Num AND l2.Num = l3.Num