Question: DROP TABLE USERS CASCADE CONSTRAINTS
This is the first SQL that uses PD to create a database. What do you mean? ?
answer:
It is to delete the table Users, and delete it with the constraints he above. First, you will have a new table that you may remain in the previous installation can you create a new table. If the record has been referenced by Table2, it cannot be modified. If it is not referenced, you should be able to modify without the reimbursement of the primary key.
