CREATE TABLE table_202_45 (id DECIMAL, "rank" DECIMAL, "wrestler" TEXT, "no. of reigns" DECIMAL, "combined days" DECIMAL)

which professional wrestler has had the most number of reigns as nwa world heavyweight champion ?
SELECT "wrestler" FROM table_202_45 ORDER BY "no. of reigns" DESC LIMIT 1
SELECT "wrestler" FROM "table_202_45" ORDER BY "no. of reigns" DESC NULLS LAST LIMIT 1