Joins in SQL | Data Science Quiz | Day 3/30

We will concentrate on Joins in SQL on the third day of our quiz. Data Science has a lot to do with SQL and in your DS interviews, Joins in SQL will occupy a lot of time

There are mainly four types of joins in SQL
– Inner Join
– Left Join
– Right Join
– Outer Join

You can easily find the basics of these joins on Tutorials point or w3school.
In a simple terms Inner is the intersection, left is when all the rows of left table is taken, right for all the rights and outer for the complete dataset.

In your interviews, the interviewer will try to confuse you on joins in SQL. The more you solve these interview questions by your own, the better are your chances to tackle any other questions.

Apart from these 10 questions, try to solve other questions posted on the website and if you have come across good questions, PLEASE post it here for other users

Day 1 of the quiz – https://thedatamonk.com/data-science-interview-question-day1/

Day 2 of the quiz – https://thedatamonk.com/sql-interview-questions/

Make a profile on the website to participate in the quiz

If you are wondering how to make a career in Data Science then hit this link – https://thedatamonk.com/ds-career-path/

Following is the list of questions for Day 3

Practice all these Joins in SQL interview questions and post your answers

SQL output – https://thedatamonk.com/question/sql-output-question-the-moonfrog-lab-interview-question/

Join Question – https://thedatamonk.com/question/can-you-join-two-table-without-any-common-column/

SQL optimization – https://thedatamonk.com/question/you-always-have-a-big-data-i-e-millions-of-rows-in-your-tables-how-would-you-partition-it-for-optimum-performance/

Indexing in SQL – Meredith India interview question – https://thedatamonk.com/question/what-is-indexing-in-sql-meredith-india-interview-question/

SQL question on aggregate function – https://thedatamonk.com/question/what-is-the-difference-between-count-and-countcolname/

OLA interview question – FETCH – https://thedatamonk.com/question/what-is-the-use-of-fetch-command-ola-interview-question/

Machine Learning Interview Question – https://thedatamonk.com/question/what-do-you-mean-when-i-say-the-model-has-high-accuracy-in-training-dataset-but-low-in-testing-dataset/

SQL output question – https://thedatamonk.com/question/sql-query-output-exl-interview-question/

Distribution interview question – Lowe’s Interview Question – https://thedatamonk.com/question/how-do-you-measure-distribution/

Question on Join – https://thedatamonk.com/question/help-me-create-a-table-with-all-the-employee-names-and-manager-names-sql-oyo-interview-questions/

Do participate, answer and check out answers of other participants.

The Data Monk Interview Books – Don’t Miss

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Individual 50+ e-books on separate topics

Important Resources to crack interviews (Mostly Free)

There are a few things which might be very useful for your preparation

The Data Monk Youtube channel – Here you will get only those videos that are asked in interviews for Data Analysts, Data Scientists, Machine Learning Engineers, Business Intelligence Engineers, Analytics managers, etc.
Go through the watchlist which makes you uncomfortable:-

All the list of 200 videos
Complete Python Playlist for Data Science
Company-wise Data Science Interview Questions – Must Watch
All important Machine Learning Algorithm with code in Python
Complete Python Numpy Playlist
Complete Python Pandas Playlist
SQL Complete Playlist
Case Study and Guesstimates Complete Playlist
Complete Playlist of Statistics