In this post, you’ll learn about the error message -635 the delete rules cannot be different or cannot be set null in the IBM DB2 database , the reason why it occurs along with the solution to fix it
IBM DB2 Error Message
-635 the delete rules cannot be different or cannot be set null
Reason for the Error
The code is used to report that the delete rules specified in two FOREIGN KEY clauses of the CREATE TABLE statement are invalid because the table would be delete connected to the same table through multiple paths involving relationships with different delete rules or with delete rules of SET NULL.
Solution
Change the delete rule.