SQL - First Month of Year and Last day of previous month.

I have a need to pull the first month of current year and then also pull the previous month end.


1/1/2013 - 7/31/2013

I'm doing a parameter with a report and need to have this date automatically populated.  I am able to get the end of month for last month.  However, I can't seem to get the first month for the year at beginning of month.
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select trunc(sysdate,'yyyy'), trunc(sysdate,'mm') - 1 from dual
wanting "last day of month" is often associated with selection of date ranges

and further this is also often due to use of "between ...  and ..."

a simpler (and more reliable) date range selection method is to use  
a combination of >= with <

so instead of "end of month for last month" you can use "less than 1st of this month" e.g.
-- Oracle syntax
from <<whatever>>
where ( date_field >=  trunc(sysdate,'yyyy') and date_field < trunc(sysdate,'mm') )
and ...

-- MS SQL syntax
from <<whatever>>
where ( date_field >=  dateadd(YEAR, datepart(YEAR,getdate())-1900, 0)
       and date_field < dateadd(DAY, -(DAY(getdate())- 1), dateadd(DAY, datediff(DAY,0, getdate() ),0))
and ...

Open in new window

for more on the topic of "between" please see: "Beware of Between"

fyi: in mssql for last day of last month:
dateadd(DAY, -(DAY(getdate())), dateadd(DAY, datediff(DAY,0, getdate() ),0))

if the need isn't for either Oracle/SQL Server please identify dbms type/version

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