sql server - SQL Last 6 Months -


i have table containing 1 datetime column. need return rows last 6 months. can done 

where datetime_column > dateadd(m, -6, current_timestamp)

but how extend option if want return latest month beginning first day of month? e.g. run condition in middle of month (14/6/2000), latest row set 14/1/2000, return 1/1/2000. advice?

i tried subqueries (max function of datetime including month function) no success.

for ms sql server, can use:

where datetime_column >= dateadd(month, datediff(month, 0, dateadd(m, -6, current_timestamp)), 0)


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