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_2850912_7 (college_junior_club_team VARCHAR, nhl_team VARCHAR)

### Question ###
How many college/junior/club teams are ther when nhl team is edmonton oilers?

### Accurate SQL ###

SELECT COUNT(college_junior_club_team) FROM table_2850912_7 WHERE nhl_team = "Edmonton Oilers"