问题
For my project I am using oracle database where I have to work with 2 different database schema. Consider the following scenario please -
I have a schema A and in it I have a table table_a with a primary key apk
And I have another schema B and in it I have a table table_b with a primary key bpk
If both of these tables are in a same database then I can easily make a primary key - foreign key relationship.
But can I make a primary key - foreign key relation ship (or something like this) between these two columns - A.table_a.apk and B.table_b.pbk.
Thanks in advance.
回答1:
To create a foreign key that references an object in a different schema, you just need to qualify the object name
ALTER TABLE B.table_b
ADD CONSTRAINT fk_b_a FOREIGN KEY (apk) REFERENCES a.table_a( apk )
This also requires that the user B has sufficient privileges on A.table_a. The user would need to have the REFERENCES privilege and would, presumably, need to have the SELECT privilege on the table as well.
来源：https://stackoverflow.com/questions/29155012/referencing-the-foreign-key-of-another-schema