Oracle, Make date time's first day of its month

Question

I have a datevariable, I would like to have convert it to first day of its monh,

• Eg: 10/10/2010 -> 01/10/2010
• Eg: 31/07/2010 -> 01/07/2010

Answer 1

SELECT trunc(to_date('22-AUG-03'), 'MON') FROM dual;

More in the manual.
About Oracle needing a dummy FROM: Select without a FROM clause in Oracle

Answer 2

try this one

select trunc(sysdate, 'MM')firstday , trunc(last_DAY(sysdate)) lastday from dual;

Answer 3

Here is a good example:

select trunc(to_date('15.11.2019', 'DD.MM.YYYY'), 'MONTH') from dual;

Answer 4

SQL> select to_date('31/07/2010', 'DD/MM/YYYY') from dual;

TO_DATE('
---------
31-JUL-10

SQL> select trunc(to_date('31/07/2010', 'DD/MM/YYYY'), 'MM') from dual;

TRUNC(TO_
---------
01-JUL-10

SQL>

Answer 5

According to http://psoug.org/reference/date_func.html, this should work a dandy...

SELECT TRUNC(yourDateField, 'MONTH') FROM yourTable

Answer 6

select trunc(sysdate, 'mm') from dual;