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_256286_45 (type VARCHAR, yes_votes VARCHAR)

### Question ###
How many types are there for the measure where there were 312680 yes votes?

### Accurate SQL ###

SELECT COUNT(type) FROM table_256286_45 WHERE yes_votes = 312680