Which type of constraint is NOT enforced by DB2 during SQL processing?
A . Check
B . Referential
C . Primary key
D . Informational referential
Answer: D
Explanation:
Reference: https://www.ibm.com/support/knowledgecenter/en/SSEPGG_9.7.0/ com.ibm.db2.luw.admin.dbobj.doc/doc/c0020149.html