CREATE TABLE table_47803 ("Round" FLOAT, "Pick" FLOAT, "Overall" FLOAT, "Name" TEXT, "Position" TEXT, "College" TEXT)

What is the total round when DB was the position, and the pick less than 21, and Jeff Welch as the name?
SELECT SUM("Round") FROM table_47803 WHERE "Position" = 'db' AND "Name" = 'jeff welch' AND "Pick" < '21'
SELECT SUM("Round") FROM "table_47803" WHERE "Name" = 'jeff welch' AND "Pick" < '21' AND "Position" = 'db'