它会导致mysql出错
create table book_copies
(
bookid references book(bookid) on delete set null,
programme_id references library_branch(programme_id) on delete set null,
no_of_copies int
);
在此输入图像描述 https://i.stack.imgur.com/kfOOX.png
a
你缺乏types https://dev.mysql.com/doc/refman/8.0/en/data-types.html为您的专栏。每列都需要一个类型，例如int or varchar(255).
如果您的列引用主键，则它们的类型可能是int or bigint.
create table book_copies (
bookid int references book(bookid) on delete set null,
programme_id int references library_branch(programme_id) on delete set null,
no_of_copies int
)
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