Oracle SQL Tutorial 19 - ON DELETE (SET NULL and CASCADE)

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  1. Caleb Curry
  2. ON DELETE
  3. ON DELETE CASCADE
  4. ON DELETE SET NULL
  5. set null
  6. cascade
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Комментарии
Автор

I hope that you get more popular Caleb; these videos are very easy to follow and helpful!

ryanmac
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I love people with easy explanations like you. Good job! Caleb Curry shall never be deletead from Youtube records, please =D

ThiagoTourinho
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Perfectly Explained! Really helping me out with my databases class final project!

BenChilson
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man your explanations are just awesome!!!! can you start java language.that would be really

pratyushsingh
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Thank you!
Although i use different natural language, I could follow your explanation well

황회선-ki
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AWESUMM.. THNX.... I HAVE MY EXAMS TOMORROW... THNX FOR HELPING....

rahulmahalanabis
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Hi Caleb, I am new to SQL and am trying my best to learn online. I have one question... example: productID and SupplierID are primary keys in their respective tables. Both have NOT NULL attributes as primary keys. Can the productID be changed to NULL if it is a foreign key in the supplier table ? So if a table has a list of items and has the supplierID missing how does one address this? Do you think you can explain this to me? Thanks!

shydee
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Got it, it's all in the highlighting!!

Marc_Masters
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What's the alternate to UPDATE Cascade in Oracle ?

siddharthg
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Can you put code on a github link, sorta hard to follow what your saying in terms of code.

Turnpost
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I don't understand why creators is referenced to user_id and why I can't delete user_id with DELETE, I mean, creator is a FK of username, not user_id

celastik
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NOW LET'S BE MISCHIEVIOUS >:) EVIL ACTIVATED!

OrtinFargo