CREATE TABLE table_71787 ("Round" FLOAT, "Pick #" FLOAT, "Overall" FLOAT, "Name" CLOB, "Position" CLOB, "College" CLOB)

Name the total number of overall for defensive tackle
SELECT COUNT("Overall") FROM table_71787 WHERE "Position" = 'defensive tackle'
SELECT COUNT("Overall") FROM "table_71787" WHERE "Position" = 'defensive tackle'