Getting the last 12 months from a specific date is easy and can be retrieved by the following command in SQL-server. Its answer is 2014-08-17.
select Dateadd(Month, -12, '2015-08-17')
What I want is to get the last 12 months but ending at 2014-08-01 (in the above case) instead of any where in the middle of the month.
Using DATEADD
and DATEDIFF
:
DECLARE @ThisDate DATE = '20150817'
SELECT DATEADD(YEAR, -1, DATEADD(MONTH, DATEDIFF(MONTH, '19000101', @ThisDate), '19000101'))
For more common date routines, see this article by Lynn Pettis.
To use in your WHERE
clause:
DECLARE @ThisDate DATE = '20150817'
SELECT *
FROM <your_table>
WHERE
<date_column> >= DATEADD(YEAR, -1, DATEADD(MONTH, DATEDIFF(MONTH, '19000101', @ThisDate), '19000101'))