SQL: last month total

Please help with writing a query to get aggregated OrderAmount for each SalesPerson for the last month (last 28-31 days). For example, if today is 09/13/2018, we need sum from 08/13/2018 to 09/12/2018.

TableOrders
----------------
SalesPerson
OrderAmount
OrderDate


Thank you in advance.
quasar_eeAsked:
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Éric MoreauSenior .Net ConsultantCommented:
something like this:

select salesperson, sum(salesamount)
from tablesales
where date > dateadd(month, -1, getdate()
group by salesperson

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_agx_Commented:
(no points..)

I would just add a cutoff to Éric Moreau's query to exclude the current date. Here's Eric's query with the cutoff

select salesperson, sum(salesamount)
from tablesales
where date > dateadd(month, -1, getdate()
and      date < CONVERT(date, getDate())
group by salesperson
Éric MoreauSenior .Net ConsultantCommented:
good catch
Mark WillsTopic AdvisorCommented:
And dont forget the closing brackets.....
select salesperson, sum(salesamount)
from tablesales
where [date] >= CONVERT(date,dateadd(month, -1, getdate()))
and   [date] < CONVERT(date, getDate())
group by salesperson

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Using getdate() as a substitution for your actual date parameter by way of example. Using convert(date,<parameter>) to avoid the time component of a datetime / datetime2
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