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use strict;
use warnings;
...
  { data_type => "INTEGER", is_nullable => 0, size => undef },
);
__PACKAGE__->set_primary_key("id");

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    --
    -- Create a very simple database to hold book and author informati
+on
...
    INSERT INTO book_authors VALUES (4, 6);
    INSERT INTO book_authors VALUES (4, 7);
    INSERT INTO book_authors VALUES (5, 8);