Sql Select Distinct

There may be duplicate values in column of table.But we may want to only distinct values from that column. This kind of requirement is fulfilled by DISTINCT.
Syntax is as:
SELECT DISTINCT(column_name) FROM table_name 

id first_name last_name salary city
1 Johan Sumith 200000 Delhi
2 Ansh Kumar 300000 Mumbai
3 Sameer Seth 100000 Delhi
4 Pyush 250000 Kolkata
5 Shikha Anand 160000 Chandigarh
6 Rajeev Khatri 450000 Chennai
7 Ram Kumar 540000 Amritsar
8 Ritu Sharma 500000 Sonepat
9 Deepika Verma 360000 Chandigarh
10 Kuldeep Singh 270000 Simla




You can see in above table employees, in city column some cities are repeated.Suppose we want distinct city names, so we can do this as given in example.
SELECT DISTINCT(city) FROM employees 

The result will be :
city
Delhi
Mumbai
Kolkata
Chandigarh
Chennai
Amritsar
Sonepat
Simla