CREATE TABLE table_203_299 (id DECIMAL, "year" DECIMAL, "competition" TEXT, "venue" TEXT, "position" TEXT, "notes" TEXT)

how many 4x 100m relays were run ?
SELECT COUNT(*) FROM table_203_299 WHERE "notes" = '4x100m relay'
SELECT COUNT(*) FROM "table_203_299" WHERE "notes" = '4x100m relay'