CREATE TABLE table_203_873 (id DECIMAL, "model name" TEXT, "length" TEXT, "width" TEXT, "height" TEXT, "riders" DECIMAL, "capacity" DECIMAL, "description" TEXT, "portable" TEXT, "notes" DECIMAL)

how many riders does the skater model include ?
SELECT "riders" FROM table_203_873 WHERE "model name" = 'skater'
SELECT "riders" FROM "table_203_873" WHERE "model name" = 'skater'