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

total number of models created .
SELECT COUNT(DISTINCT "model name") FROM table_203_873
SELECT COUNT(DISTINCT "model name") FROM "table_203_873"