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_1942366_9 ( category VARCHAR, low VARCHAR )

### Question ###
In how many different categories is the value of C_{low} 35.5?

### Accurate SQL ###

SELECT COUNT(category) FROM table_1942366_9 WHERE STRUCT(low) = "35.5"