MySQL SELF JOINS are ... ughhh
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- Опубліковано 4 лис 2022
- #MySQL #tutorial #course
00:00:00 example 1
00:05:44 example 2
00:00:00 conclusion
SELECT a.first_name, a.last_name,
CONCAT(b.first_name," ", b.last_name) AS "reports_to"
FROM employees AS a
INNER JOIN employees AS b
ON a.supervisor_id = b.employee_id;
SELECT a.first_name, a.last_name,
CONCAT(b.first_name," ", b.last_name) AS "reports_to"
FROM employees AS a
INNER JOIN employees AS b
ON a.supervisor_id = b.employee_id;
Your explanations are on point. My professor is pretty much like “Figure it out yourself, look at the PPT” SMH.
Most of my college education right here. “Hey guys we’re going to learn Java. Here’s a piece of paper with some code. I’m a math teacher good luck.”
Best self join explanation I've found so far. 10/10!!!
Thanks a ton for making this series! Subbed!!
You're the best teacher ever !!!! I really appreciate your work for us!!!
Dude this was so incredibly helpful. Thank you!
a chad in explaining. Thanks much!
Its a great video easy to understand Thank you, some people over explain things that makes it over complicated but after watching this video it looks pretty simple now.
thank you for explaining!
EXCELLENT EXPLANATION ! thank you
This was awesome. Thank you
Your explanation is awesome!
truly and bro coder appreciate it bro
Thanks! joins were pain until I found you
thank you that was great!
SO helpful.. thank you !
Bro, can you do an Oracle DBMS series too😍...your videos are life savers! God bless you!
I'm pretty sure my teacher will somehow over-complicate this course if they ever teach this lol.
you are amazing
best video on self join
Bro, nice vid. ONE QUESTION! What keyboard shortcut are you using to track to the beginning of a word? As you have done it makes more sense for me to type the column and THEN the table even though sql syntax requires this info in the opposite order. The shortcut would make it easier - i cant find it online.🙏
He's probably using Ctrl+'any-arrow-key' for PC, and it would be Command+'any-arrow-key' for Mac.
nice BRO!
that was practical. thanks
Thanks Bro
I never knew Mrs. Puff’s first name was Poppy 🤯
same lol
super easy and helpful
I have a question which making me not getting this whole self join thing why couldn't we refer our join condition on table A customer ID =table 2 manager ID why did we have to refer to the foreign key of the first table instead of the primary key.your answer is greatly appreciated.
u are great but can u do tut for website full course
How can i change my screen to see the same way you do?
Pleaseeeee.
Thanks for your video!
I knew from the title (self joins are...ughhh) 😆 it's not as usual.
i am a beginner... We have to create employee ids such a way that when we write the code, it has to point the correct way right? I mean what if we made Mr. Squidward's employee id 6?
Top 10
i want to ask a question, why after we use the inner join, on a.supervisor_id = b.employees_id; the sandy name will repeated a few times, i still didnt get why
Because she is a supervisor of multiple people. You're looking at each row of the left table and see who is the supervisor for each employee in that table which is Sandy except for Sandy herself. Her supervisor is Crabs.
bro need full join also bro please.........
Let's be honest.. Krabs isn't gonna comp ANYONE a free meal.
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