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_name_87 ( net_yards INTEGER, yards_per_attempt VARCHAR, touchdowns VARCHAR, attempts VARCHAR )

### Question ###
What are the average net yards that have 9 as the touchdowns, 145 as the attempts, and yards per attempt greater than 4.8?

### Accurate SQL ###

SELECT AVG(net_yards) FROM table_name_87 WHERE touchdowns = 9 AND attempts = 145 AND yards_per_attempt > 4.8