CREATE TABLE table_203_800 (id DECIMAL, "#" DECIMAL, "president" TEXT, "president's party" TEXT, "senate with" DECIMAL, "senate opposed" DECIMAL, "house with" DECIMAL, "house opposed" DECIMAL, "years served" DECIMAL, "elections won" DECIMAL)

what is the difference in senate opposed between john quincy adams and james garfield ?
SELECT ABS((SELECT "senate opposed" FROM table_203_800 WHERE "president" = 'john quincy adams') - (SELECT "senate opposed" FROM table_203_800 WHERE "president" = 'james garfield'))
SELECT ABS((SELECT "senate opposed" FROM "table_203_800" WHERE "president" = 'john quincy adams') - (SELECT "senate opposed" FROM "table_203_800" WHERE "president" = 'james garfield'))