SQL work 4 part 1 and 2

Learning Goal: I’m working on a computer science question and need an explanation and answer to help me learn.

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Question: A quick question on Homework #4 part 1, In Tape table can we create C_Number and M_Number as foreign key constraints.

Response: You need to set two foeeign keys in Tape table. One reference Customer and another reference Movie.

For these two foreign keys, ” on update cascade, on delete set null “. To make these work set these two columns in Tape as “Not required” otherwise it would fail when try to set “on delete set null”.

“on delete set null” mean s if we delete a Customer or Movie, C_number or M_number column in the corresponding row in Tape would become null.

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