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_17697980_1 ( no_of_episodes INTEGER, year VARCHAR )

### Question ###
What is the largest number of episodes for a 1989 season dvd release?

### Accurate SQL ###

SELECT MAX(no_of_episodes) FROM table_17697980_1 WHERE year = "1989"