DB2关系表

Question

Is it possible to create a database such that there are 2 tables across 2 different schemas within the database who reference each other?

I would like to clarify my question with an example.

Consider the tables, EMPLOYEE (empID, empName, deptId) and DEPARTMENT (deptId, deptName) . We can impose a foreign key constraint on the EMPLOYEE.deptId . In this case can I have these two tables across two different schemas and still impose the constraint?

Answer 1

The answer is yes. DB2 does not require both tables in a foreign key relationship to reside in the same schema.

Answer 2

You mean via foreign keys or in joins?

Sure: Just always prefix the table name with the schema name and a "." (dot). Like so:

select t1.id, t2.id from schema1.table1 t1 join schema2.table2 t2 on t1.fid = t2.id