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_1973816_2 ( left VARCHAR, enrollment VARCHAR )

### Question ###
In what year did the school with enrollment of 650 leave?

### Accurate SQL ###

SELECT left FROM table_1973816_2 WHERE enrollment = 650