CREATE TABLE railway (railway_id NUMBER, railway CLOB, builder CLOB, built CLOB, wheels CLOB, location CLOB, objectnumber CLOB)
CREATE TABLE manager (manager_id NUMBER, name CLOB, country CLOB, working_year_starts CLOB, age NUMBER, level NUMBER)
CREATE TABLE train (train_id NUMBER, train_num CLOB, name CLOB, from CLOB, arrival CLOB, railway_id NUMBER)
CREATE TABLE railway_manage (railway_id NUMBER, manager_id NUMBER, from_year CLOB)

Show the locations that have more than one railways.
SELECT location FROM railway GROUP BY location HAVING COUNT(*) > 1
SELECT "location" FROM "railway" GROUP BY "location" HAVING COUNT(*) > 1