How to ignore duplicate values in select query

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PostgreSQL

Hi all

when i am writing select * from table_name, it is taking only the unique bill_no's and returning the values.
please tell me how to write a query where it will take all the values from the table even if there is duplicate bill_no also.

Note: bill_no is not primary key

<pre lang="text">
bill_no  datetime                   amount
1;      "2014-12-23 17:36:07";      382.02
1;      "2014-12-23 09:08:37";      1452.38
2;      "2014-12-23 18:18:26";      472.99
2;      "2014-12-23 09:56:44";      380.95
3;      "2014-12-23 10:00:07";      666.67
3;      "2014-12-23 18:42:43";      159.18
4;      "2014-12-23 10:12:54";      200.00
4;      "2014-12-23 18:43:25";      77.31
5;      "2014-12-23 10:15:21";      7857.14
5;      "2014-12-23 18:45:27";      409.31
6;      "2014-12-23 20:50:56";      318.36
6;      "2014-12-23 10:16:00";      761.90
7;      "2014-12-23 20:59:59";      109.16
7;      "2014-12-23 10:16:58";      1571.43

</pre>

Thank you