CREATE TABLE table_203_839 (id NUMBER, "station" CLOB, "type" CLOB, "latitude" CLOB, "longitude" CLOB, "el.  ( m ) " NUMBER, "opened" NUMBER, "closed" NUMBER, "coordinates" CLOB)

how many stations opened after 1917 ?
SELECT COUNT("station") FROM table_203_839 WHERE "opened" > 1917
SELECT COUNT("station") FROM "table_203_839" WHERE "opened" > 1917