Hello Programmers/Coders, Today we are going to share solutions of Programming problems of HackerRank of Programming Language SQL. At Each Problem with Successful submission with all Test Cases Passed, you will get an score or marks. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.
In this post, you will find the solution for Challenges in SQL-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.
Use “Ctrl+F” To Find Any Questions Answer. & For Mobile User, You Just Need To Click On Three dots In Your Browser & You Will Get A “Find” Option There. Use These Option to Get Any Random Questions Answer.
Introduction To SQL
SQL stands for Structured Query Language. SQL is used to create, remove, alter the database and database objects in a database management system and to store, retrieve, update the data in a database. SQL is a standard language for creating, accessing, manipulating database management system. SQL works for all modern relational database management systems, like SQL Server, Oracle, MySQL, etc.
- It is a standard language for Relational Database System. It enables a user to create, read, update and delete relational databases and tables.
- All the RDBMS like MySQL, Informix, Oracle, MS Access and SQL Server use SQL as their standard database language.
- SQL allows users to query the database in a number of ways, using English-like statements.
Link for the Problem – Challenges SQL – Hacker Rank Solution
Challenges SQL – Hacker Rank Solution
Problem:
Julia asked her students to create some coding challenges. Write a query to print the hacker_id, name, and the total number of challenges created by each student. Sort your results by the total number of challenges in descending order. If more than one student created the same number of challenges, then sort the result by hacker_id. If more than one student created the same number of challenges and the count is less than the maximum number of challenges created, then exclude those students from the result.
Input Format
The following tables contain challenge data:
- Hackers: The hacker_id is the id of the hacker, and name is the name of the hacker.
- Challenges: The challenge_id is the id of the challenge, and hacker_id is the id of the student who created the challenge.
Sample Input 0
Hackers Table: 
Challenges Table: 
Sample Output 0
21283 Angela 6 88255 Patrick 5 96196 Lisa 1
Sample Input 1
Hackers Table:Challenges Table:
Sample Output 1
12299 Rose 6 34856 Angela 6 79345 Frank 4 80491 Patrick 3 81041 Lisa 1
Explanation
For Sample Case 0, we can get the following details:
Students and both created challenges, but the maximum number of challenges created is so these students are excluded from the result.
For Sample Case 1, we can get the following details:
Students and both created challenges. Because is the maximum number of challenges created, these students are included in the result.
Challenges SQL – Hacker Rank Solution
SELECT H.HACKER_ID,
H.NAME,
COUNT(C.CHALLENGE_ID) AS TOTAL
FROM HACKERS H,
CHALLENGES C
WHERE H.HACKER_ID=C.HACKER_ID
GROUP BY H.HACKER_ID,
H.NAME
HAVING COUNT(C.CHALLENGE_ID) IN
(SELECT MAX(TOTAL)
FROM
(SELECT COUNT(*) AS TOTAL
FROM CHALLENGES
GROUP BY HACKER_ID))
OR COUNT(C.CHALLENGE_ID) IN
(SELECT TOTAL
FROM
(SELECT COUNT(*) AS TOTAL
FROM CHALLENGES
GROUP BY HACKER_ID)
GROUP BY TOTAL
HAVING COUNT(TOTAL)=1)
ORDER BY COUNT(C.CHALLENGE_ID) DESC, H.HACKER_ID;
I believe this site has very great written written content articles.
Fantastic beat ! I wish to apprentice while you amend your site, how could i subscribe for a blog web site? The account helped me a acceptable deal. I had been a little bit acquainted of this your broadcast offered bright clear idea
Woh I love your content, saved to bookmarks! .
As a Newbie, I am constantly exploring online for articles that can aid me. Thank you
I was blown away by the level of depth and analysis in this article. The author’s ability to present complex issues with nuance and sensitivity is truly impressive, and their commitment to presenting a range of perspectives on each topic is commendable. What I love most about this article is its commitment to presenting balanced and unbiased perspectives on a range of issues, which is increasingly rare in today’s media landscape. Overall, this article is a valuable resource for anyone looking to stay informed on important social and political issues.
I visited a lot of website but I believe this one has something extra in it in it
You have brought up a very good details , thanks for the post.
Deference to website author, some superb information .
The very core of your writing whilst sounding reasonable originally, did not work perfectly with me personally after some time. Somewhere throughout the sentences you actually were able to make me a believer unfortunately just for a while. I still have a problem with your jumps in assumptions and one might do nicely to help fill in those breaks. In the event you can accomplish that, I will undoubtedly end up being impressed.
It’s laborious to seek out educated individuals on this matter, but you sound like you already know what you’re speaking about! Thanks
Your place is valueble for me. Thanks!…
Very efficiently written story. It will be valuable to anybody who utilizes it, as well as myself. Keep doing what you are doing – for sure i will check out more posts.
Write more, thats all I have to say. Literally, it seems as though you relied on the video to make your point. You clearly know what youre talking about, why waste your intelligence on just posting videos to your weblog when you could be giving us something informative to read?
Hi, I think your site might be having browser compatibility issues. When I look at your website in Safari, it looks fine but when opening in Internet Explorer, it has some overlapping. I just wanted to give you a quick heads up! Other then that, fantastic blog!
Amazing blog! Do you have any suggestions for aspiring writers? I’m hoping to start my own website soon but I’m a little lost on everything. Would you propose starting with a free platform like WordPress or go for a paid option? There are so many options out there that I’m totally overwhelmed .. Any tips? Cheers!
It’s hard to find knowledgeable people on this topic, but you sound like you know what you’re talking about! Thanks
Hello would you mind stating which blog platform you’re using? I’m planning to start my own blog in the near future but I’m having a difficult time selecting between BlogEngine/Wordpress/B2evolution and Drupal. The reason I ask is because your layout seems different then most blogs and I’m looking for something completely unique. P.S Apologies for being off-topic but I had to ask!
Very good written article. It will be helpful to everyone who usess it, including yours truly :). Keep doing what you are doing – can’r wait to read more posts.
Hi, Neat post. There’s a problem along with your site in internet explorer, may check this?K IE still is the marketplace leader and a large component of other folks will leave out your fantastic writing due to this problem.
Thank you for another great article. Where else could anyone get that kind of info in such a perfect way of writing? I have a presentation next week, and I am on the look for such information.
It is really a great and useful piece of information. I’m glad that you shared this useful information with us. Please keep us up to date like this. Thank you for sharing.
oral tadalafil 10mg order tadalafil 40mg pills buy ed pills fda
Good write-up, I¦m normal visitor of one¦s web site, maintain up the nice operate, and It’s going to be a regular visitor for a lengthy time.
order cefadroxil 500mg sale finasteride oral finasteride online
buy fluconazole 200mg pills order cipro 1000mg without prescription order ciprofloxacin 500mg generic
order estradiol for sale estrace 2mg over the counter order minipress 2mg sale
flagyl 400mg over the counter buy flagyl tablets cephalexin 500mg pills
order cleocin 300mg online erythromycin generic top ed pills
order indocin 50mg capsule indocin 75mg brand buy cheap suprax
buy generic trimox 500mg brand trimox 500mg buy clarithromycin medication
bimatoprost medication order robaxin 500mg order desyrel online cheap
buy catapres 0.1mg pill order antivert 25mg buy spiriva without prescription
suhagra 50mg without prescription buy sildalis without prescription sildenafil overnight shipping usa
purchase minocin sale purchase minocycline generic cost pioglitazone 15mg
accutane usa brand azithromycin 250mg buy zithromax online cheap
arava pills leflunomide 20mg sale purchase sulfasalazine for sale
With havin so much content do you ever run into any issues of plagorism or copyright violation? My blog has a lot
of exclusive content I’ve either authored myself or outsourced but it seems
a lot of it is popping it up all over the internet without my agreement.
Do you know any ways to help reduce content from being
ripped off? I’d really appreciate it.
order cialis 20mg without prescription oral tadalafil 5mg tadalafil 10mg generic
azithromycin where to buy azipro price gabapentin 100mg cheap
ivermectina buy stromectol 12mg without prescription deltasone 40mg canada
lasix 40mg sale what to do when allergy medicine doesn’t work cost ventolin 4mg
levitra 20mg over the counter zanaflex generic hydroxychloroquine oral
ramipril 10mg sale oral ramipril 5mg etoricoxib 60mg usa
This is a very good tips especially to those new to blogosphere, brief and accurate information… Thanks for sharing this one. A must read article.
order vardenafil 10mg pill buy vardenafil paypal buy plaquenil 200mg sale
cost asacol buy asacol order irbesartan 300mg online cheap
order olmesartan pill brand depakote depakote brand
temovate price buy cheap generic clobetasol amiodarone pills
clobetasol brand amiodarone over the counter amiodarone tablet
carvedilol 25mg over the counter coreg buy online aralen cheap
buy diamox 250 mg without prescription imuran 25mg generic purchase imuran generic