CREATE TABLE table_57282 ("Last" TEXT, "First" TEXT, "Year" FLOAT, "Sport" TEXT, "Country" TEXT)

Name the sum of year for swimming and first of mike
SELECT SUM("Year") FROM table_57282 WHERE "Sport" = 'swimming' AND "First" = 'mike'
SELECT SUM("Year") FROM "table_57282" WHERE "First" = 'mike' AND "Sport" = 'swimming'