Get the name of a row's source table when querying the parent it inherits from

Question

I have a Postgres database with several tables that inherit from one other. I can SELECT from the parent table to get results from all it\'s children, but need

Answer 1

To identify the source table of a particular row, use the tableoid, like you found yourself already.
A cast to regclass retrieves the actual name, automatically schema-qualified where needed according to the current search_path.

SELECT *, tableoid::regclass::text AS table_name
FROM   master.tbl
WHERE  <some_condition>;

More:

• Find out which schema based on table values
• Select (retrieve) all records from multiple schemas using Postgres
• How does the search_path influence identifier resolution and the "current schema"

Answer 2

This is answered in the PostgreSQL documentation, in the section on inheritance. One can use the hidden tableoid column of the table along with relname from pg_class to add a column containing the table names to the result, as shown:

SELECT t.*, p.relname FROM table t, pg_class p WHERE t.tableoid = p.oid;