Added Final Destination

Author: thecoddiwompler

Final Destination/READme.md

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+# Final Destination
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+
+---
+
+## 🛠️ Problem Statement
+
+  <b>Table Name : Flights</b>
+
+|  Column Name  |Type |
+| ------------- | ------------- |
+| cid          | VARCHAR(512)     |
+| fid     | VARCHAR(512) |
+| origin | VARCHAR(512) |
+| Destination | VARCHAR(512) |
+
+* fid (Flight ID) is the primary key column for this table.
+* Each row of this table indicates the cid (Customer ID), fid, Origin, and Destination of the flight.
+<br/>
+
+
+
+Write a SQL query to find the Initial Origin and Final Destination for each cid.</br>
+Return the result table ordered by cid in ascending order.
+
+</br>
+The query result format is in the following example. 
+</br>
+</br>
+ <details>
+<summary>
+Input
+</summary>
+  <br>
+  <b>Table Name: Flights</b>
+
+| cid | fid | origin | destination |
+|-----|-----|--------|-------------|
+| 1   | f1  | Del    | Hyd         |
+| 1   | f2  | Hyd    | Blr         |
+| 1   | f3  | Blr    | Pune        |
+| 2   | f4  | Mum    | Agra        |
+| 2   | f5  | Agra   | Kol         |
+
+
+</details>
+
+<details>
+<summary>
+Output
+</summary>
+
+| cid | origin | destination |
+| ---- | ---- | ---|
+| 1  | Del   | Pune |
+| 2  | Mum   | Kol |
+
+</details>
+
+---

Final Destination/schema.sql

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+CREATE TABLE flights (
+    cid VARCHAR(512),
+    fid VARCHAR(512),
+    origin VARCHAR(512),
+    Destination VARCHAR(512)
+);
+
+INSERT INTO
+    flights (cid, fid, origin, Destination)
+VALUES
+    ('1', 'f1', 'Del', 'Hyd'),
+    ('1', 'f2', 'Hyd', 'Blr'),
+    ('1', 'f3', 'Blr', 'Pune'),
+    ('2', 'f4', 'Mum', 'Agra'),
+    ('2', 'f5', 'Agra', 'Kol');
+
+COMMIT;

Final Destination/solution.sql

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+WITH intermediate_origin AS (
+    SELECT
+        a.cid,
+        a.fid,
+        a.origin,
+        a.destination,
+        b.destination prev_destination
+    FROM
+        flights a
+        LEFT OUTER JOIN flights b ON a.cid = b.cid
+        AND a.origin = b.destination
+),
+intermediate_destination AS (
+    SELECT
+        a.cid,
+        a.fid,
+        a.origin,
+        a.destination,
+        b.origin next_destination
+    FROM
+        flights a
+        LEFT OUTER JOIN flights b ON a.cid = b.cid
+        AND a.destination = b.origin
+)
+SELECT
+    a.cid,
+    a.origin,
+    b.destination
+FROM
+    intermediate_origin a
+    INNER JOIN intermediate_destination b ON a.cid = b.cid
+WHERE
+    prev_destination IS NULL
+    AND next_destination IS NULL;

iqsql.md

@@ -1,10 +1,11 @@
 1. Department Top 3 Salary
 2. Employees Check-in Details
 3. Employees Hiring [Difficult]
-4. Highest-Grossing Items
-5. Increasing Sales Revenue
-6. Last Person to Fit in the Bus
-7. Manager with at least 5 direct reportees
-8. Mismatched IDs
-9. Odd and Even Measurements
-10. Qualifying Criteria
+4. Final Destination
+5. Highest-Grossing Items
+6. Increasing Sales Revenue
+7. Last Person to Fit in the Bus
+8. Manager with at least 5 direct reportees
+9. Mismatched IDs
+10. Odd and Even Measurements
+11. Qualifying Criteria