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_15017024_2 ( height VARCHAR, player_name VARCHAR )

### Question ###
How many heights does chad henne have?

### Accurate SQL ###

SELECT COUNT(height) FROM table_15017024_2 WHERE player_name = "Chad Henne"