Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_1081459_1 (introduced INTEGER, region VARCHAR)

### Question ###
What is the minimum introduced value for the Departmental region?

### Accurate SQL ###

SELECT MIN(introduced) FROM table_1081459_1 WHERE region = "Departmental"