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_88 (pick INTEGER, position VARCHAR, round VARCHAR, school_club_team VARCHAR)

### Question ###
Which Pick has a Round larger than 1, a School/Club Team of alcorn state, and a Position of defensive back?

### Accurate SQL ###

SELECT SUM(pick) FROM table_name_88 WHERE round > 1 AND school_club_team = "alcorn state" AND position = "defensive back"