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_15431959_1 ( no_in_season INTEGER, directed_by VARCHAR )

### Question ###
How many seasons did Peter Deluise direct Stargate SG-1?

### Accurate SQL ###

SELECT MAX(no_in_season) FROM table_15431959_1 WHERE directed_by = "Peter DeLuise"