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_3480 ( "District" real, "Representative" text, "Party" text, "Residence" text, "First Elected" text, "Term Limited" real )

### Question ###
If the Representative is Barbara sears, what is the district number?

### Accurate SQL ###

SELECT MAX("District") FROM table_3480 WHERE "Representative" = 'Barbara Sears'