As someone who received SQL training during master's degree, I have to say that I learned much more from Alex's SQL lessons than what I learned at school. You are amazing Alex!
Perfectly clear explanation. However, I also noticed wrong information: 7:17 You said, "In your Subquery, you can only have 1 column selected". However, you can select multiple columns by using parentheses --------> WHERE (a, b) IN (SELECT a, b FROM x)
All your SQL tutorial videos from the basic up to this have helped me understand SQL, MUCH BETTER compared to the explanation that I've got from a bootcamp. Your explanation is so complete and concise. Thank you so much, Alex!
@@alexter001122 yes. I finished my bootcamp in Sep-2021, then applied for a data analyst position at various startups, did some interviews, and started working as a data analyst in Feb-2022.
I cannot speak for MySQL course cause I haven't attended it but, having attended other technical Coursera (and Google, too) Courses I fet a little bit disappointed regarding the content. Definitively, too much bla bla bla and little practical approach.
I thought I knew SQL, but this whole series of videos help me understand that I don't know anything. Although your explanation was ease to follow and understand, I feel that need more study to really understand all the concepts.Thanks a lot for your time to make this series.
This has come just in time for an interview I have in the morning for a modelling analyst position, can't begin to describe how much your videos have helped! Keep up the crazy good work you are doing here!
Holy mackerel! We think and code exactly the same.This is exactly how I teach people about sub-queries, and partition by, and even the rarely used 'right join' which is similar to 'not in' where clause sub-query.
Thank you Alex! 🙌 For the last year I’ve been learning about data analysis/computer science part time, with the goal to move into the tech industry so that I can WFH, be available to my kids, and have income growth potential. Your videos were fundamental to my learning. I just landed my first job in the industry, and I attribute a big part of that to you.
Today i have completed SQL😩😩🥰❤️ Am so grateful for having found your channel, i believe by 2024 i will land a data analyst role in government or health care all studying from this bootcamp from scratch🙏🙏🙏 never been as committed, thank you so much once again, tomorrow am starting off with Python
Just finished this series, thank you so much, you've re-ignited my passion for learning again. These simple, clear explanations of concepts has given me the confidence to dive back into more advanced concepts again.
I love your videos, content is never enough. I know sometimes may be obvious to talk about something like subqueries when we have lots of content in the internet, but your explanation is very pertinent and very didatic, i learned a lot today. For this I thank you.
I Am glad I followed the whole series of SQL tutorials from easy to advanced. Now I am clear on the concept. Now I am going to follow a real-world project of yours.
I've just finished this series (1 week). I'm going to rewatch it all again (hopefully 1 day) and then start the Portfolio Project. I started from 0 and your videos are purely useful content, it made me understand SQL really fast. Thanks from Spain. PD: I will communicate here when I finish the course completly and also if I am lucky enough to get a job.
I just finished the Beginner, Intermediate, and Advanced SQL videos. Thank you, Alex, for publishing these. I'm adding SQL to my tool belt. These were a fantastic first look at the language.
Done for SQL Tutorial after 3 weeks of learning and spending 2-3 hours in each session while creating different scenarios outside the samples. hehe Mygee! I made it! haha! Thank you Alex! Next step is to get a certificate of SQL before proceeding to the other Tools. Hopefully I'm doing it right. Lol
Thank you so much Alex! I went through the basic, intermediate and advanced SQL Tutorials. I would love to learn more about the store procedures in detail!
Thanks for letting us know that for a subquery in the SELECT and WHERE clauses; it can only have a single value and single column respectively as an output.
Thanks so much for these tutorials! I had a basic understanding of queries in ArcMap for GIS data and didn't understand why it was really that important but now thinking of it as having a database that has pre-made queries that can be manipulated in different ways to process and analyze data has made me understand its importance!
Brilliant SQL Tutorial Series! Every Video has really helped to fill in any potential gaps in my knowledge and even reinforce my existing skills. Thanks Alex!
You posted a tutorial on CTE before this. I am following from the older videos to the newer ones so I got lost for a bit and had to come find this. Thank you for making learning easy
Thanks for giving such a clear and concise explanation for why one would use subqueries! I'm currently working through the Google Data Analyst certification program and your explanation and approach was much easier to understand than the instructor who presented on this very topic.
Thank you for sharing, really really appreciate this. I would love to see more advanced stuff, specifically examples where you're using synonyms across different servers within source stored procedures (used to populate stage tables) to make joins along with ctes. I am at an internship right now, and still in my first year of college, I feel completely lost when working in these health insurance databases, most videos on youtube don't really go into more complicated stuff that I work with everyday so thank you again Many of these queries in the code base are 3000+ lines long and my brain goes numb looking at all the subqueries, joins, and obscure functions I have no idea what they do
I have enjoyed your videos. I have been programming and working as a dba for a long time, 28 years - since sql server 4.2. (Do you remember *=). I would consider myself an expert in sql server. I was even able to pick up a couple things in your sql videos that I didn’t know or at least did 8n a different way. Great job. Looking forward to the python and newer content. Working towards learning how to use ML to help clean data and find errors over the next year.
Thank you for your work and detailed explanations Alex. I mainly use COGNOS and COGNOS SQL so this is a great crash course for me to learn the differences between the two.
Hi! I just tried the syntax for subquery in where but I tried it also using join and got exact result *Alex subquery in Where* select EmployeeID, JobTitle, Salary from EmployeeSalary where EmployeeID in ( select EmployeeID from EmployeeDemographics where Age > 30 ) *my syntax*: select demo.EmployeeID, JobTitle, Salary from EmployeeDemographics as demo join EmployeeSalary as sal on demo.EmployeeID = sal.EmployeeID where Age > 30 Anyway, I find your tutorial very informative and tried to use some work arounds if they will have the same output. Thank you always, Alex!
I just finished the SQL tutorial from beginner to advanced. Now I want to start the portofolio project but part 2 & 4 of that video are missing. Let me know when those video already uploaded. thank you very much and sorry if there's something wrong about this comment, I'm still learning English
Hello Alex, why did you create the subquery when to get the average you could have just specified : "SELECT EmployeeID, Salary, (AVG)salary FROM EmployeeSalary"? I am really confused and would be glad if you could help.
I just learned this recently! Wonder do you have any recommendation for an intermediate level courses after the beginner course? I'm 75% done with my SQL beginner course. Thanks! :)
Hey Alex thanks for making videos which are so informative and helpful..as a mechanical engineer who wants to change his profession to data analyst ..what will u suggest to learn first
This looks like a really interesting subject. I didn’t know anything about it until now, but I suspect the exponential, geometric, and weibull distributions might factor in?
Hey Alex! All your videos on Sql Tutorials are awesome! Can you make a video on how to use primary and foreign keys in Sql Server? You've mentioned in one of your videos that you'll be covering those topics but I haven't come across the PK and FK in the Sql Tutorials(maybe I've missed them). Or if you have a video already out, could you direct me to it? Thanks for all the videos, they've helped me understand SQL Server much better!
Just to clarify, only the where statement combined with the subquery can only have 1 column selected? SELECT and FROM can select all columns if wanted from a subquery? thanks!
I actually got really good at CTEs first, then Temp tables and last was subqueries. Apparently thats backwards lol. My struggle is knowing when to use each one. I've written queries using all 3 for one reason or another, most of the time it just depends on how i feel that day as i haven't noticed any differences in the run time or results
Is there a further explanation as to why we can't see the AVG salary for all employees when we don't use a subquery or partition by? I am not understanding how GROUP BY EmployeeID, Salary is not the same.
Thanks for the video! Studying SQL with DataCamp but the explanation on subqueries is very short..
ปีที่แล้ว
Hi Alex! I'm following you in LinkedIn. Pls, keep me post it about the data analyst bootcamp you plan to launch. I, myself I am changing career. I want to be more technical marketer with strong focus on web analytics and touching here and there analytics subjects....
Mr Alex. I'm currently following your steps on tge sql project but it shows me operand divide. And it is giving me errors . Please someone show help me out
The entire, Beginner, Intermediate, and Advanced playlists are a gold mine, Alex!
Thank You!!!
Glad you like them!
where is advance sql playlist
As someone who received SQL training during master's degree, I have to say that I learned much more from Alex's SQL lessons than what I learned at school. You are amazing Alex!
Perfectly clear explanation. However, I also noticed wrong information:
7:17 You said, "In your Subquery, you can only have 1 column selected". However, you can select multiple columns by using parentheses --------> WHERE (a, b) IN (SELECT a, b FROM x)
All your SQL tutorial videos from the basic up to this have helped me understand SQL, MUCH BETTER compared to the explanation that I've got from a bootcamp. Your explanation is so complete and concise. Thank you so much, Alex!
Really glad to hear it! :D
Question: were you able to land an analyst job after finishing your bootcamp?
@@alexter001122 yes. I finished my bootcamp in Sep-2021, then applied for a data analyst position at various startups, did some interviews, and started working as a data analyst in Feb-2022.
I have a Coursera certificate in MySQL, but you've explained it so much better than the instructor of that course.
I cannot speak for MySQL course cause I haven't attended it but, having attended other technical Coursera (and Google, too) Courses I fet a little bit disappointed regarding the content. Definitively, too much bla bla bla and little practical approach.
I'm taking that course right now. Have to heavily supplement it with the mode tutorial because the actual course lacks soooo much detail and examples!
Same. Taking a 4 week class from Coursera and i was stuck on week 3 where the instuctor teaches subquiries and joins. Hope this video will help
@@tasadem20 I’m having the same problem in week 3, I couldn’t understand the instructor and she didn’t not explain correctly
I have the same issue on datacamp, before I realised I was already doing nested subqueries and CTEs 💀
I thought I knew SQL, but this whole series of videos help me understand that I don't know anything. Although your explanation was ease to follow and understand, I feel that need more study to really understand all the concepts.Thanks a lot for your time to make this series.
This has come just in time for an interview I have in the morning for a modelling analyst position, can't begin to describe how much your videos have helped! Keep up the crazy good work you are doing here!
best of luck and i hope you celebrate with us when you get it. cheers
did you get that job ?
Holy mackerel! We think and code exactly the same.This is exactly how I teach people about sub-queries, and partition by, and even the rarely used 'right join' which is similar to 'not in' where clause sub-query.
Thank you Alex! 🙌 For the last year I’ve been learning about data analysis/computer science part time, with the goal to move into the tech industry so that I can WFH, be available to my kids, and have income growth potential. Your videos were fundamental to my learning. I just landed my first job in the industry, and I attribute a big part of that to you.
How was your journey now? Mind sharing us your experience?
Today i have completed SQL😩😩🥰❤️ Am so grateful for having found your channel, i believe by 2024 i will land a data analyst role in government or health care all studying from this bootcamp from scratch🙏🙏🙏 never been as committed, thank you so much once again, tomorrow am starting off with Python
wish you all the best in your journey. consistency is key 💪
How is it now????
Excellent, someone who knows how to zoom in for those watching on mobile!!!!
The editing here is seamless. Love how it all comes together!
Just finished this series, thank you so much, you've re-ignited my passion for learning again. These simple, clear explanations of concepts has given me the confidence to dive back into more advanced concepts again.
I love your videos, content is never enough. I know sometimes may be obvious to talk about something like subqueries when we have lots of content in the internet, but your explanation is very pertinent and very didatic, i learned a lot today. For this I thank you.
So glad to hear that! And I agree - sometimes one good explanation of something is all you need to really get the grasp of it
Hello matheus please can we chat on telegram I need assistance
Thanks for the great tutorial! Currently on my Google Data Analytics Certificate! This video made it easier to understand the concept!
I Am glad I followed the whole series of SQL tutorials from easy to advanced. Now I am clear on the concept. Now I am going to follow a real-world project of yours.
I've just finished this series (1 week). I'm going to rewatch it all again (hopefully 1 day) and then start the Portfolio Project. I started from 0 and your videos are purely useful content, it made me understand SQL really fast.
Thanks from Spain.
PD: I will communicate here when I finish the course completly and also if I am lucky enough to get a job.
do tell
How is it now?
@@mizerosamuel5613 I got a job. :) This really helped me!
@@mizerosamuel5613i got one bro
King, you are the best sql teacher on youtube. Thanks SO much for making content on sql concepts that are actually used in everyday work flows.
I just finished the Beginner, Intermediate, and Advanced SQL videos. Thank you, Alex, for publishing these. I'm adding SQL to my tool belt. These were a fantastic first look at the language.
This performance gave me goosebumps. Incredible talent!
Done for SQL Tutorial after 3 weeks of learning and spending 2-3 hours in each session while creating different scenarios outside the samples. hehe Mygee! I made it! haha! Thank you Alex! Next step is to get a certificate of SQL before proceeding to the other Tools. Hopefully I'm doing it right. Lol
Thanks Alex for teaching Advance SQL REALLY QUICK.
Thank you so much Alex! I went through the basic, intermediate and advanced SQL Tutorials. I would love to learn more about the store procedures in detail!
You're most welcome! Thanks for learning with me :)
Thanks for letting us know that for a subquery in the SELECT and WHERE clauses; it can only have a single value and single column respectively as an output.
Just finished watching all sql tutorial videos in this bootcamp. Time to watch the portfolio project.
You have a knack for storytelling. Well done! 🎥
Your videos are good Alex.
We need a playlist of SQL needed for data science. Its a request. :)
After roaming around with other tutorials, it makes your tutorial more valued. Thanks sir
Thanks so much for these tutorials! I had a basic understanding of queries in ArcMap for GIS data and didn't understand why it was really that important but now thinking of it as having a database that has pre-made queries that can be manipulated in different ways to process and analyze data has made me understand its importance!
This helped me with [insert task]. You’re a lifesaver! 😇
Had troubles understanding some concepts from a bootcamp but your explanations are amazing! Concise, precise and easy to understand.Thank you!
This content is gold. Thank you for putting this out here!
Finally finish this advanced tutorial. Keep going for next series...
Brilliant SQL Tutorial Series! Every Video has really helped to fill in any potential gaps in my knowledge and even reinforce my existing skills. Thanks Alex!
Im taking a test today and this is the perfect video for a quick reminder of everything.
I am Finally done with SQL on this amazing channel. But got to go back for some revisions.
Thank you so much for posting this series. I am learning SQL for the first time and your videos are extremely helpful :)
The way you capture moments is so beautiful. 😍
Keep up the Amazing content Alex!
Amazing video! Your hard work truly paid off. 👏
You posted a tutorial on CTE before this. I am following from the older videos to the newer ones so I got lost for a bit and had to come find this. Thank you for making learning easy
Wow, this changed my perspective. Great job! 💡
This is a great video about subquery. Thank you, Alex!
Thanks for giving such a clear and concise explanation for why one would use subqueries! I'm currently working through the Google Data Analyst certification program and your explanation and approach was much easier to understand than the instructor who presented on this very topic.
Thank you for sharing, really really appreciate this. I would love to see more advanced stuff, specifically examples where you're using synonyms across different servers within source stored procedures (used to populate stage tables) to make joins along with ctes. I am at an internship right now, and still in my first year of college, I feel completely lost when working in these health insurance databases, most videos on youtube don't really go into more complicated stuff that I work with everyday so thank you again
Many of these queries in the code base are 3000+ lines long and my brain goes numb looking at all the subqueries, joins, and obscure functions I have no idea what they do
I have enjoyed your videos. I have been programming and working as a dba for a long time, 28 years - since sql server 4.2. (Do you remember *=). I would consider myself an expert in sql server. I was even able to pick up a couple things in your sql videos that I didn’t know or at least did 8n a different way. Great job. Looking forward to the python and newer content. Working towards learning how to use ML to help clean data and find errors over the next year.
Thank you Alex, i really learnt a lot from the beginners series up this advance series
Where is primary and foreign key video could you please share the link
I can’t get over how good the beat drop is. 😩
I have taken udacity course on sql and i applied the course on an actual db but your tutorials are much better realy specially on the joins
On my journey through the boot camp...
This comes in handy. Thank you.
I learned so much with your videos. You made learning SQL very fun. I enjoyed your examples. Thank you!
You just basically saved my career now
Very helpful. All your videos about SQL are very easy to grasp and concise. Thank you so much.
I’ve been using SQL on my job since 2007, and I swear that I still don’t know everything I should know when it comes to really "complicated" queries.
Same lol
Me too.
I wish I had this during my undergrad over a decade ago.
Thank you for your work and detailed explanations Alex. I mainly use COGNOS and COGNOS SQL so this is a great crash course for me to learn the differences between the two.
Thank you so much Alex for providing such a valuable skills for free. It really made me become a aspiring data analyst.
Great explanation of subqueries. Thanks.
Hi! I just tried the syntax for subquery in where but I tried it also using join and got exact result
*Alex subquery in Where*
select EmployeeID, JobTitle, Salary
from EmployeeSalary
where EmployeeID in (
select EmployeeID
from EmployeeDemographics
where Age > 30
)
*my syntax*:
select demo.EmployeeID, JobTitle, Salary
from EmployeeDemographics as demo
join EmployeeSalary as sal
on demo.EmployeeID = sal.EmployeeID
where Age > 30
Anyway, I find your tutorial very informative and tried to use some work arounds if they will have the same output. Thank you always, Alex!
Sounds like Dane Cook is teaching me SQL. Good video, thank you.
What program is used here? It looks like a Jupyter NB for SQL
This is tremendously helpful. Got to resolve a blocker because of you. Thanks!
Thank you so much. I had trouble understanding sub-queries. You've explained it so well. 😎
keep up the good work sir. I have been following your videos and techtfq videos as well and learned so much
I just finished the SQL tutorial from beginner to advanced. Now I want to start the portofolio project but part 2 & 4 of that video are missing. Let me know when those video already uploaded. thank you very much and sorry if there's something wrong about this comment, I'm still learning English
Thank you Alex for ur way in simplifying the training! Are you giving later more advanced videos about SQL or that is all ?
WOAHH!!!😍😍 Thank you so much for making it easy :)
Hello Alex, why did you create the subquery when to get the average you could have just specified :
"SELECT EmployeeID, Salary, (AVG)salary
FROM EmployeeSalary"?
I am really confused and would be glad if you could help.
do you have any suggestions on where I could practice these functions more? and this playlist is really beneficial thanks for the time and effort!
What happens if you remove "over ()" from the "with Partition By" example?
I just learned this recently! Wonder do you have any recommendation for an intermediate level courses after the beginner course? I'm 75% done with my SQL beginner course. Thanks! :)
Hey Alex thanks for making videos which are so informative and helpful..as a mechanical engineer who wants to change his profession to data analyst ..what will u suggest to learn first
This looks like a really interesting subject. I didn’t know anything about it until now, but I suspect the exponential, geometric, and weibull distributions might factor in?
I'd love a tutorial for working with SSIS Packages
God bless you, Mr. SQL.
You should remind ppl to like your videos. I really like all your videos, super helpful~~~ but always forget to like it....
Hello teacher where can I load those data to practice following your explanations?
Thank you
Hey Alex! All your videos on Sql Tutorials are awesome! Can you make a video on how to use primary and foreign keys in Sql Server? You've mentioned in one of your videos that you'll be covering those topics but I haven't come across the PK and FK in the Sql Tutorials(maybe I've missed them). Or if you have a video already out, could you direct me to it? Thanks for all the videos, they've helped me understand SQL Server much better!
Thank you so much, Alex. Your videos are superb.
Just to clarify, only the where statement combined with the subquery can only have 1 column selected? SELECT and FROM can select all columns if wanted from a subquery? thanks!
I'm curious about the alias or variable "a" you gave to the subquery. Just trying to understand why this is necessary.
Hello Alex,
Where can we find some practice excercises to practice SQL queries?
Try StrataScratch.com or Leetcode.com :)
@@AlexTheAnalyst Thank You 🙂
I actually got really good at CTEs first, then Temp tables and last was subqueries. Apparently thats backwards lol. My struggle is knowing when to use each one. I've written queries using all 3 for one reason or another, most of the time it just depends on how i feel that day as i haven't noticed any differences in the run time or results
Subquery can also alternatively be replaced by temp table or CTE.
Is there a further explanation as to why we can't see the AVG salary for all employees when we don't use a subquery or partition by? I am not understanding how GROUP BY EmployeeID, Salary is not the same.
Had an issue with the server connection, any idea to fix that?
that was really quick
Hello Alex
I love ur videos they v been guiding me through data analysis but i v issues with my sql
How about doing an AVG SALARY for each employee instead of AVG FOR ALL? How do you query that?
Thanks for the video! Studying SQL with DataCamp but the explanation on subqueries is very short..
Hi Alex! I'm following you in LinkedIn. Pls, keep me post it about the data analyst bootcamp you plan to launch. I, myself I am changing career. I want to be more technical marketer with strong focus on web analytics and touching here and there analytics subjects....
I wanna ask a question, that can we build charts and graphs in mysql for reporting?
you have mentioned many times windows function, but what is it? do you have a video on it?
Excellent Tutorial
Mr Alex. I'm currently following your steps on tge sql project but it shows me operand divide. And it is giving me errors . Please someone show help me out
Please make a video on Window Functions. I love your videos :)
This wasn't bad but do you anything other than "really quick"? You said it 21 times in 8:30
Thanks Alex.
Great course
hello Alex and thanks for greate videos.
What "over ()" means?
thanks