An error message:

ERROR $1452(23000)$: Cannot add or update a child row: a foreign key constraint fails $(`$csit$115`.`$COURSE$`,$ CONSTRAINT $`$course$\_$fkey$1`$ FOREIGN KEY $(`$offered$\_$by$`)$ REFERENCES $`$DEPARTMENT$`(`$name$`)$ ON DELETE CASCADE$)$

means, that

Question $11$Answer

a$.$

INSERT statement cannot insert a new row that has a value of foreign key different from all values of the respective primary key

b$.$

INSERT statement cannot insert a new row that has a value of primary key the same as one of the values of the respective foreign key

c$.$

INSERT statement cannot insert a new row that has a value of primary key different from all values of the respective foreign key

d$.$

INSERT statement cannot insert a new row that has a value of foreign key the same as one of the values of the respective primary key