Introducing FOREIGN KEY constraint 'c_name' on table 't_name' may cause cycles or multiple cascade paths

Question

I have a database table called Lesson:
columns: [LessonID, LessonNumber, Description] ...plus some other columns

I hav

Answer 1

You can't have more than one cascading RI link to a single table in any given linked table. Microsoft explains this:

You receive this error message because in SQL Server, a table cannot appear more than one time in a list of all the cascading referential actions that are started by either a DELETE or an UPDATE statement. For example, the tree of cascading referential actions must only have one path to a particular table on the cascading referential actions tree.