Name the Round which has a Position of defensive back and corey chavous?
CREATE TABLE table_44942 (
    "Round" real,
    "Pick" real,
    "Player" text,
    "Position" text,
    "School/Club Team" text
)
SELECT MIN("Round") FROM table_44942 WHERE "Position" = 'defensive back' AND "Player" = 'corey chavous'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Name the Round which has a Position of defensive back and corey chavous? ### Input: CREATE TABLE table_44942 (
    "Round" real,
    "Pick" real,
    "Player" text,
    "Position" text,
    "School/Club Team" text
) ### Response: SELECT MIN("Round") FROM table_44942 WHERE "Position" = 'defensive back' AND "Player" = 'corey chavous'