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Tip of the Day
Language: SQL
Expertise: Intermediate
Jun 7, 2006

Retrieve the Month's First Day for a Date

This code shows you how to retrieve the month's first day for a date:

/*create a table to store a number, a dummy unique value and a date*/
create table t_ (
  i number,
  d date

/*set the date format to dd.mm.yyyy*/
alter session set nls_date_format = 'dd.mm.yyyy';

/*insert a few dates*/
insert into t_ values (1, to_date('05.03.2000'));
insert into t_ values (2, to_date('19.04.2001'));
insert into t_ values (3, to_date('25.08.2003'));
insert into t_ values (4, to_date('01.07.2002'));
insert into t_ values (5, to_date('18.02.2000'));
insert into t_ values (6, to_date('21.10.2003'));

/*Select the first day of the month for which the date is stored in the database table. This is achieved by using the trunc function*/
select i, trunc(d,'month') from t_;
Amit Vij
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