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Foreign Key Settings

I will start by mentioning that I am very new to databases. I am working in MySQL.

Can anyone give me a layman's view of when you would use which settings for the foreign key options so when you would use On Delete: Cascade, On Delete: Set Null, On Delete: No Action. Also, how would these work in the sense of foreign keys in a bridging table, does it depend on the context of the database as in what data it contains or is there a general rule of thumb as to which setting is best in this type of relationship?

If you can, please state it simply as I am not totally au fait with the jargon given I am a relative newbie. Thanks so much


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