Where with Date returns only one day data

Question

SELECT col1,col2 FROM bill WHERE
trunc (TO_DATE(time_stamp, 'yyyy/mm/dd HH:MI:SS AM') = trunc (TO_DATE('2012/01','yyyy/mm');
This only returns data for first day of the month and need data for a month.

Answer 1

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SELECT col1,col2 FROM bill WHERE
trunc (TO_DATE(time_stamp, 'yyyy/mm/dd HH:MI:SS AM') = trunc (TO_DATE('2012/01','yyyy/mm');
This only returns data for first day of the month and need data for a month.
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Well a TRUNC without a format string only gives you one day. If you want to trunc to the month you need a 'MM' format string.
SELECT sysdate, trunc(sysdate), trunc(sysdate, 'MM'),
trunc(TO_DATE('2012/01','yyyy/mm')) td from dual
SYSDATE,TRUNC(SYSDATE),TRUNC(SYSDATE,'MM'),TD
10/30/2012 6:48:53 PM,10/30/2012,10/1/2012,1/1/2012