Question

I’ve inherited a schema so don’t have complete knowledge/confidence in what is there.

I have a project table with a projectId. There are a whole bunch of other tables that reference this table by project id. What I want to do is run a query to establish:

1. Which tables have foreign key references to the project table on
   the project id
2. Which tables have a column called project id (in
   case foreign keys are not set up).

If it was SQL Server I know how to query the metadata but how do I do this in Oracle?

Answer 1

1)

select table_name
  from all_constraints
 where r_constraint_name = [your pk/uk constraint on PROJECTS(id)]

2)

select table_name
  from all_tab_columns
 where column_name = 'PROJECT_ID'

You may want to add an extra predicate containing the OWNER column.

Regards,
Rob.