SQL Project Planning Hacker Rank Solution

Hello coders, In this post, you will learn how to solve the SQL Project Planning Hacker Rank Solution. This problem is a part of the SQL Hacker Rank series.

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SQL Project Planning - Hacker Rank Solution
SQL Project Planning Hacker Rank Solution

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SQL Project Planning Hacker Rank Solution

Problem

You are given a table, Projects, containing three columns: Task_IDStart_Date and End_Date. It is guaranteed that the difference between the End_Date and the Start_Date is equal to 1 day for each row in the table.

If the End_Date of the tasks are consecutive, then they are part of the same project. Samantha is interested in finding the total number of different projects completed.

Write a query to output the start and end dates of projects listed by the number of days it took to complete the project in ascending order. If there is more than one project that have the same number of completion days, then order by the start date of the project.

Sample Input

Sample Output

2015-10-28 2015-10-29
2015-10-30 2015-10-31
2015-10-13 2015-10-15
2015-10-01 2015-10-04


Explanation

The example describes following four projects:

  • Project 1: Tasks 12 and 3 are completed on consecutive days, so these are part of the project. Thus start date of project is 2015-10-01 and end date is 2015-10-04, so it took 3 days to complete the project.
  • Project 2: Tasks 4 and 5 are completed on consecutive days, so these are part of the project. Thus, the start date of project is 2015-10-13 and end date is 2015-10-15, so it took 2 days to complete the project.
  • Project 3: Only task 6 is part of the project. Thus, the start date of project is 2015-10-28 and end date is 2015-10-29, so it took 1 day to complete the project.
  • Project 4: Only task 7 is part of the project. Thus, the start date of project is 2015-10-30 and end date is 2015-10-31, so it took 1 day to complete the project.


SQL Project Planning – Hacker Rank Solution

SELECT START_DATE, MIN(END_DATE)
FROM
  (SELECT START_DATE
   FROM PROJECTS
   WHERE START_DATE NOT IN
       (SELECT END_DATE
        FROM PROJECTS)) A,
  (SELECT END_DATE
   FROM PROJECTS
   WHERE END_DATE NOT IN
       (SELECT START_DATE
        FROM PROJECTS)) B
WHERE START_DATE < END_DATE
GROUP BY START_DATE
ORDER BY (MIN(END_DATE) - START_DATE), START_DATE;

Disclaimer: The above Problem (SQL Project Planning) generated by Hackerrank but the Solution is Provided by Chase2Learn. This tutorial is only for Educational and Learning purposes. Authority if any of the queries regarding this post or website fill the following contact form thank you.

FAQ:

Is HackerRank good for SQL practice?

You’ve probably heard of HackerRank before, so it should be no surprise to you that they have one of the best collections of SQL practice challenges around.

Which SQL does HackerRank use?

The HackerRank Test interface has an in-built database query editor and supports programming in Microsoft SQL, MySQL, Oracle, or DB2 databases.

What is HackerRank SQL?

Basic. Get Certificate. SQL is an industry-standard query language that works with relational databases. Unlike some earlier systems, queries are performed at the server and only the results are passed to a client. This resulted in the ability to work with large databases efficiently over a network. 

How many questions are there in HackerRank for SQL?

That will also help your SQL code challenges journey

It took me a bit more than two weeks (on and off between work, workout, and taking the kid to day school, etc.) to finish all the 58 SQL challenges on the site, and I gained quite some insights from the journey (and having quite some fun doing that!).

Where can I find HackerRank solutions in SQL?

in this post, you will get all the solutions of HackerRank SQL Problems.

Conclusion:

Finally, we are now, in the end, I just want to conclude some important message for you

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