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_name_95 ( conference_joined VARCHAR, previous_conference VARCHAR, mascot VARCHAR )

### Question ###
Which Conference Joined has a Previous Conference of northwestern, and a Mascot of oilers?

### Accurate SQL ###

SELECT conference_joined FROM table_name_95 WHERE previous_conference = "northwestern" AND mascot = "oilers"