Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE employee (city VARCHAR, age INTEGER)

### Question ###
Which cities do more than one employee under age 30 come from?

### Accurate SQL ###

SELECT city FROM employee WHERE age < 30 GROUP BY city HAVING COUNT(*) > 1