Retrieve the Month’s First Day for a Date

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*/alter session set nls_date_format = '';/*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_;
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