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<fieldset>
<label for="id_default_engine">Engine: </label>
<select id="id_default_engine" name="default_engine">
<option selected="" value="1">Postgres</option>
<option value="2">MySQL</option>
<option value="3">Python</option>
<option value="4">R</option>
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A curated list of 217 SQL & Python coding questions and solutions.
Available engines: PostgreSQL, MySQL, Python and R.
* Question
* Solution
118. DAILY BOOKINGS IN THE US
hard airbnb
--------------------------------------------------------------------------------
* Write a query to return the daily number of bookings (reservations)
inĀ JulyĀ 2021 in the US.
* If there is no booking, return 0.
Table 1: bookings sample data
bookings
date booking_id listing_id 2021-08-28 73761653 1000001 2021-08-28 3314809
1000002 2021-07-18 51052327 1000009
Close
When someone makes a reservation on Airbnb.
col_name | col_type
--------------+-------------------
date | date
booking_id | bigint
listing_id | bigint
Table 2: dates sample data
dates
year month date 2019 1 2019-01-01 2019 1 2019-01-02 2019 1 2019-01-03 2019 1
2019-01-04 2019 1 2019-01-05
Close
Calendar dates from 01/01/2019 to 12/31/2025.
col_name | col_type
----------+----------
year | smallint
month | smallint
date | date
Table 3: listings sample data
listings
listing_id country created_dt 1000001 UK 2021-08-22 1000002 DE 2021-07-27
1000003 US 2021-08-08
Close
When a new Airbnb listing is created in a country ('US', 'UK', 'JP', 'CA', 'AU',
'DE')
col_name | col_type
--------------+-------------------
listing_id | bigint
country | varchar(2)
created_dt | date
Solution postgres
WITH us_bookings AS (
SELECT
B.date,
COUNT(booking_id) AS num_bookings
FROM bookings B
INNER JOIN listings L
ON L.listing_id = B.listing_id
AND L.country = 'US'
GROUP BY date
)
SELECT
D.date,
CASE WHEN B.num_bookings IS NULL THEN 0 ELSE B.num_bookings END AS num_bookings
FROM dates D
LEFT JOIN us_bookings B
ON B.date = D.date
WHERE D.date >= '2021-07-01'
AND D.date < '2021-08-01'
ORDER BY D.date;
Copy
Explanation
This query is designed to count the number of bookings made in US listings for
each date within the specified time range. It accomplishes this by first
selecting all bookings made in US listings and grouping them by date. This
subquery is named "us_bookings".
The main query then selects all dates within the specified time range and left
joins them with the "us_bookings" subquery on the date field. This is done to
ensure that all dates within the specified range are included in the result,
even if there were no bookings made on that date.
The final select statement returns the date and the number of bookings made on
that date, with a case statement to handle cases where there were no bookings
made on a particular date.
The result is ordered by date.
Copied
Expected results
Engine: Postgres MySQL Python R
/* 1. For data safety, only SELECT statements are allowed 2. Results have been
capped at 200 rows */ SELECT * FROM bookings LIMIT 5;
xxxxxxxxxx
12
Ā
1
/*
2
ā
3
1. For data safety, only SELECT statements are allowed
4
2. Results have been capped at 200 rows
5
*/
6
SELECT *
7
FROM bookings
8
LIMIT 5;
9
ā
10
ā
11
ā
12
ā
Submit Run
Your Results
š Wow, you nailed it! Awesome! Try Next Question.
Nice try! But your results are incorrect.
Need some help? Upgrade and view our solutions and step by step explanations.
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Land a dream position at Amazon!
Hi Leon, I hope you're doing well. I wanted to reach out and say thanks for your
interview prepāit really helped me land a position at Amazon. It's been a
fulfilling experience!
David
Data Engineer at Amazon
Data Engineer Offer from Amazon!
I got a job offer at Amazon as a Data Engineer! I worked with Leon and he was
super helpful to me at every stage of the process of getting a new role! He
helped me strategize a study plan for technical interviews, shared knowledge of
what different data roles are like and which one I would like, and evaluate and
negotiate what is important to me in the offer!
The best thing that I learned working with Leon is how to spend my time
effectively in the interview process. Interviewing is not one of my strengths,
but Leon empowered me to get to my goals!
Leon is really smart and has years of experience in Data, and knows the hiring
process inside and out. It is so worth it to be able to learn from his
experience! I have nothing but gratitude!
Jude
Data Engineer at Amazon
Senior Data Engineer Offer from Spotify!
Thank you so much @Leon !
Your advice and coaching are extremely helpful for preparations for the
interviews. The timeline and pacing you helped plan worked out very well.
It kept me on the right track. The exercise on coding and data analytics you
recommended greatly sharpened my skills to solve the problems during the
technical rounds.
The practice to communicate project work to peers is another highlight to help
me earn higher score. Again thank you so much for all your advice!
Steven Hwang
Senior Data Engineer at Spotify
50% Salary Increase! !
Thank you so much @Leon!
Your advice and coaching are extremely helpful for preparations for the
interviews. The timeline and pacing you helped plan worked out very well.
It kept me on the right track. The exercise on coding and data analytics you
recommended greatly sharpened my skills to solve the problems during the
technical rounds.
The practice to communicate project work to peers is another highlight to help
me earn higher score. Again thank you so much for all your advice!
Joey Huang
Machine Learning Engineer at ļ£æ Apple
Dream job offer from ļ£æ Apple!
Hi @Leon and @Mike ,
Just wanted to share, I accepted an offer from Apple as a Data Engineer and
wanted to offer a huge thank you to both of you guys.
Even though I only shared a time with you both I benefited a lot from your
platform and your mock interviews.
Some of the questions you gave during our Data Modeling with you Mike were
presented verbatim.
- Steve
Data Engineer at ļ£æ Apple
Recommending him!
Shout out to Leon Wei from sqlpad.io, recommending him if you are searching for
great advises and mentorship for your #datasciences career.
Feng Xue
Software Engineer at Microsoft
The mock interview helped me do it in the right way
š¬ SQLPad helped me gain mastery of all the core SQL concepts in a structured
manner with a thoughtfully designed business schema. The associated articles and
videos are also very well produced and helped me get a better understanding of
translating business questions to actual SQL code. Highly recommended for anyone
looking to deepen their SQL skills and those applying for data analytics roles.
Nisheeth
Data Engineer at Square
Shoutout to Leon Wei from instamentor.com.
Please do reach out to him if you're looking for career advice, general
consulting, or resume feedback. I found his services extremely valuable.
And while you're at it, please do check out SQLPad if you're looking to refresh
your SQL concepts.
Jonathan D'Cruz
Data Science Manager at Swiggy
sqlpad.io seems more intuitive and lightweight where some of the other sites try
to do too much and they're a bit cumbersome to use.
I like the Leaderboard. Probably my biggest reason for signing up was the fact
that you gave so much information away for free.
I signed up for your emails, was going through the mini courses, using the
Playground and I got more benefit out of all of that in two weeks than I did at
the other websites. Glad I found sqlpad.io.
Jim Woodwood
Data analyst
Received offers from Walmart and Jaguar Land Rover
Thank you so much for your help and support this year. I am pleased to say I
received two offers Software Engineer 3 at Walmart and a Senior Machine learning
engineer position at JLR based out of the UK.
- Sahana
Senior Machine Learning Engineer
Simply put, SQLPad is not the cheapest SQL interview prep site, but its high
quality SQL interview questions makes it worth every penny. You can't practice
anywhere else of such well thought and carefully designed business context
oriented list of SQL coding questions.
I nailed my SQL interviews and received multiple Data Scientists offers that
potentially double my currently salary, which makes the few hundreds dollars
purchase of SQLPad lifetime bundle a steal.
I can always come back and use SQLPad when I want to prepare my next SQL
interview.
- James
Incoming FAANG Data Scientist
Dream data scientist job offer!
I've tried several sites to practice SQL and sqlpad.io is my favorite because
the questions are well-designed to focus on the most important concepts. Some of
the other sites are all over the place.
With sqlpad.io, I can focus on questions by skill level or topic, and the number
of questions available is a reasonable amount to study for interview prep.
In addition, I got mentoring sessions with Leon and I was impressed at how
helpful it was. Leon was calm and knowledgeable, which helped my nerves over my
up-coming interview.
He really takes mentoring seriously and it makes a big difference. After
practicing my SQL, I got my data science dream job!
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Data Scientist
Yes, I really like it too. Simple, straightforward and to the point. It is
really helping me a big time. Yesterday, I have solved a few questions on sqlpad
and the similar problem I had to solve at work today. The methodology really
helped me to build an efficient solution. I can recommend this platform to my
friends and colleagues without any doubt.
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Data scientist
I want to give a big shout out to @theleonwei, founder of SQLPad. Absolutely had
the pleasure of learning SQL on SQLPad. There are 80 plus SQL challenges ranging
from easy to hard. I can now say that I have become more confident.
- Karma Dolma Gurung
Data scientist
Worked through all the problems at sqlpad - Great teaching / refresher tool and
highly recommended!
ā Mike Metzger
Data Architect
I have been relearning SQL and sqlpad has been a great resource. There is a good
ratio of a new concept to practice questions! Highly recommended.
- Anup Kalburgi
Data engineer
š¬ "I signed up on SQLPad and was pleasantly surprised when Leon helped me out
personally on the website.
In two mock interviews with him, he was meticulously prepared and very
professional.
Throughout the interview he provided fantastic feedback and frameworks on how to
be better prepared for both technical and behavioural aspects of an interview.
He is also a very positive and friendly person and I enjoyed all my interactions
with him.
ā Rahul Nayak
Senior Business Intelligence Engineer
š¬ SQLPad is the best website I have used for practicing SQL. The databases and
practice problems resemble real-world data and daily tasks in a data scientist /
data analyst role. I landed a new job as a data scientist at a tech company
after completing all the practice problems. I would definitely recommend SQLPad
to all who would like to improve their SQL skills and prepare for technical
interviews.
ā William
Data scientist, received a great job offer at a top tech company
š¬ This course helped me get into a final round of a data scientist interview at
Facebook. Didn't get an offer eventually because I didn't do well during the
product sense round. However I got great feedback for my SQL interview session.
Highly recommend this course to any fresh college graduates.
ā Justin
Data scientist candidate, final round of Facebook interview
š¬ I want to thank you for creating this website and it is a great resource for
anyone to practice. I really appreciate the effort. I feel so confident with SQL
after practicing here.
ā Juhi
Data science professional
š¬ I am currently in question 30, I really like some of the questions you posted
here. Also thank you for your excellent customer service !!!! Thanks ššš
ā Mamath
Data scientist candidate
āļøāļøāļøāļøāļø
š¬ Enjoying it so far, love the mix with practical exercises and the focus to
land a job, that's really important because normal courses do not prepare you
for interviews. Also, Leon is really kind and helpful.
ā Jose
Data scientist
š¬ This site is a great resource for SQL interview practice questions. The
interface is excellent! And even as someone who currently uses SQL for their day
job, I have definitely improved my skills by working through these problems.
ā Kyle
Data scientist candidate
š¬ Thanks for sqlpad. Really loving the experience. As someone transitioning
into a data analyst position this is a great resource. Looking forward to your
mentorship program.
ā Su
Transitioning into data analyst
āļøāļøāļøāļøāļø
š¬ Great course on SQL. Very comprehensive. All the SQL material I've pales
compared to this.
ā Len
Fresh Data Science Graduate
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COMMONLY ASKED QUESTIONS
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You are given 10 FREE SQL/Python coding questions to try out, after that, your
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Upgrade to a paid planĀ will unlock it immediately and also give you access
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Courses.
On average, it takes about 3-4 months to finish all the coding questions.
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We currently don't offer one-time orders.
However, you can subscribe to the monthly service, pay for the first month and
unsubscribe.
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your solutions will be persisted and ready to be accessed the next time you
re-subscribe.
Is there a refund policy? account
Since we have already provided you a FREE tier to practice a limited set of
questions, we cannot refund you once your subscription starts.
Cancellation and Refund Policy
1. Monthly/Quarterly subscriptions
Once your subscription starts, you CAN NOTĀ get a refund for any payments you've
already made.
If you don't want to subscribe anymore, cancel your subscription.
You will have access to the subscription until the end of the period you have
paid for.
2.Ā Ā One time purchase
Unfortunately, we can not refund one-time purchases, including but not limited
to EBook, Ultimate Bundle, and Job Search ultimate bundle.
I have found my dream job and would like to cancel my subscription, how can I do
it? account
Absolutely, congratulations, and we totally understand you need to take a break
and celebrate.
To cancel your subscription, simply:
1. Sign in to your account, go to your account dashboard, then clickĀ Manage
Plan.
2. A customer portal page will pop up (Hosted on Stripe). Follow the
step-by-step instructions to cancel your subscription.
What happens after?
You will still have access until the end of your subscription period, similar to
your other subscription like ļ£æ Apple Music or Netflix.
If you want to delete your account permanently,Ā shoot us a messageĀ with your
username and email, and we will delete your account within 24 business hours.
Who is behind SQLPad? general
Hi, my name is Leon Wei. Most recently, I was a senior manager of machine
learning at ļ£æ Apple. I am currently building an AI data analytics tool:
skills.ai while running sqlpad.io. You can read more about me at my linkedin
profile.
Iāve been using SQL for over 10 years, and it is still my go-to programming
languageĀ to prepare data.
Before that, I lead a team of data scientists and engineers at Chegg, helping
students or young professionals to improve their performance at school or work.
I also workedĀ as a research scientist at Amazon, focusing on building a
large-scale real-time pricing optimization engine for their online retail
business.Ā
The questions seem to be so easy, why? general
We created the cracking the SQL interview for the data scientist course with a
beginner's mindset, and we assume our audience has 0 experience with SQL.
That's why the first 10 questions may seem to be very easy for experienced
users, butĀ you will find more and more challenging and tricky hard level
questions as you move along to later questions.
What is SQLPad's goal? general
The goal of sqlpad is to help people in data analytics/science quickly learn or
refresh their SQL, Python/Pandas skills.
It could be for a job interview or be more productive at work.
Do you offer any discount? general
We offer 20% off for students, educational institutions and startups.Ā Email us
(hello at sqlpad dot io) from your .edu or work email to request a discount
code.
We do not offer any other discounts.
Can I use your SQL problems and course materials somewhere else? general
Unfortunately NO.
We have designed and created the entire SQL course and curated all 200 SQL
coding questions single-handedly, which took us more than 3000Ā hours of hard
work, therefore you are not allowed to use any of those questions outside of
this website, without our written permission.
If you represent a company and are interested to acquire a license to use our
coding questions and solutions, please feel free to contact us.
Why did you create sqlpad.io? general
From sqlpad's founder Leon wei.
After launchingĀ the Cracking the SQL Interview for Data ScientistsĀ course, I
realized theĀ need for my students toĀ easily follow the course andĀ practice SQL
coding problems.
SinceĀ I can't find a solution online, I builtĀ SQLPad.
All the SQL exercisesĀ can be practicedĀ in a browser, and my students don't have
to waste hours configuring the database on their own computers.
Which version are the SQL and Python engines? general
As of March 21, 2023.
Those are the major version of our online playground.
PostgreSQL: 13.9
MySQL: 8.0
Python: 3.10
Pandas: 1.5
Ā
Why choose SQLPad vs. Leetcode? general
SQLPad is the Leetcode alternative that makes learning and mastering SQL
forĀ data analytics professionalsĀ instead ofĀ software engineers. It createsĀ a
complete SQL mastery path for allĀ data scientists.
--------------------------------------------------------------------------------
š§āš» Our approach to tackling a SQL interview is to first teach you SQL
fundamentals withĀ the cracking the SQL Interview for data scientists
courseĀ before asking you to jump into the coding war.
š¹ More than 20 video lectures to learn SQL fundamentals and tips and tricks
help you understand what a SQL interview is about.
šļøāāļø After you grasp the basics, you then jump into SQL coding questions that
challenge you and make sure you mastered those SQL fundamental concepts.
š± Leetcode jumps directly into some super long, hard-to-understand SQL coding
questions that may frustrate you, especially if you just started.
š Instead, SQLPad has a more gradual, more user-friendly learning experience
for all SQL skill levels.
šæ The first 80 SQL coding questions are based onĀ the same Movie rental
database, which resembles a real-world commerce business.
š¤ From easy-level questions to challenging ones, you gradually build up a good
understanding of the database schema by practicing those questions.
š©āš» And by the time you are to solve some of the most advanced SQL interview
questions (#58-80), such as WINDOW functions and LAG/Lead, you are already
familiar with those tables. You can jump right into the coding environment after
learning the concepts.
Who is SQLPad and the Cracking the SQL Interview course for? general
The Cracking SQL Interview course is a comprehensive course but is really
focused on improving your SQL interview skills, with tips and techniques that
I've learnt from interviewing thousands of data professional candidates. It
saves time by concentrating on things that really matter.
We have seen satisfied customers ranging from fresh college STEM students
searching their first industry jobs, and young professionals who want to switch
their career track to work on data science.
SQLPad and the SQL interview course significantly improved their hands-on data
processing capabilities, with laser-focused learning materials, to help land
their dream job offers.
What database engine is SQLPad based on? technical
(Update 01/26, 2022, we now also support MySQL and Python, more info.)
Great question, SQLPad's online playground, and the coding challenge's online
judge is currently based on the latest Postgres.
Its query syntax is similar to other databases such as MySQL or Microsoft SQL
Server, one of the major differences is onĀ Postgres'sĀ DateTime related
functions.
More details can be found here:
https://www.postgresql.org/docs/current/functions-datetime.html
For example, there is no datediffĀ function in Postgres, but you can subtract one
DateTime columnĀ from anotherĀ directly using the minus '-' operator, which is
actually quite convenient and easier to type once you get the hang of it.
If you would like to see other database engines implemented on SQLPad, please
let us know.
Ā
Ā
I just graduated, how should I get started looking for a job? technical
There is definitely a lot to prepare forĀ your first job hunt, especially given
the current COVID-19 situation, hiring managers to receive a lot more
applications from qualified candidates, and it pushes the hiring bar
significantly higher than before.
If you are interested to know more about how to prepare a data scientist
interview, I wrote a blog to explain different types of data scientists tracks.
And if you are interested in finding a job search mentor to help you get started
with a concrete plan. Feel free to email us if you have any questions.
Do you support dark mode? technical
Yes, we now support dark mode!
To switch between light and dark mode, simply click the toggle button located at
the top right of the navbar.
Can you learn sql on a mac? technical
Yes, you totally can.
SQL interview questions andĀ Ā SQL Playground work in all modern web browsers,
including Chrome, Safari, Firefox in ļ£æ Mac, Windows, LinuxĀ and other operating
systems.
Some of your solutions are not optimized, why? technical
Good question, I created the solutions in a specific style/format (e.g.,
usingĀ IN instead of JOIN), so my students who take the Cracking the SQL
interview for Data Scientists Course can follow along.
I have been gradually adding more solutions (optimized) and will indicate if
that solution is for more advanced users.
If you have a better solution than mine, please feel free to let me know!
Ā
What is a SQL interview and why it is important? technical
SQL is a must-know programming language for any analytics track data scientists,
it is theĀ lingua franca for processing and managing data in the industry. Iāve
been using SQL for many years, and it is still my go-to language to prepare and
manage data.
However, it is not a strong-typed language, and there are many popular database
systems with different syntaxes and built-in functions, it could be very
confusing for first-timers.
As a hiring manager or part of the hiring committee, I often ask a lot of SQL
questions during a data scientist job interview, and to make sure the candidate
will be hands-on at work.
However, in my 15 years career, I have met so many fresh college graduates or
young professionals starting their job searches without solid coding skills in
SQL, and in the end, they didnāt get a job offer.
The SQL interview can bear other names and may be calledĀ Ā Technical AnalysisĀ or
Data InterviewĀ during a FAANG company interview, you might be asked to perform a
series of SQL operations to extract data and insights, and answer follow-up
questions about their products.
(*) FAANG: Facebook, amazon, apple, Netflix and google
Have more questions? Please feel free to contact us, we read and respond to
every email you send us, just give us some time. š
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