No promany key in parent table, how to use delete cascade?

Dear All,

I want to dreate a delete cascade in children tables.  The primary key of 
parent table is oid, so when I create parent table, there is no apparetly 
key word "primary key".  The problem jumps out.

When I create child table using columnn constraint on delete, the SQL says:

"PRIMARY KEY for referenced table "parent" not found"

I do not need to specify the primary key since I am using oid.  How can I 
get around this problem?

Thanks.

Zhidian Du



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