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Como obter os dados do último mês e os dados do mês atual

Today including time info  : getdate()
Today without time info    : DATEADD(DAY, DATEDIFF(day, 0, getdate()), 0)
Tomorrow without time info : DATEADD(DAY, DATEDIFF(day, 0, getdate()), 1)
Beginning of current month : DATEADD(month, datediff(month, 0, getdate()), 0)
Beginning of last month    : DATEADD(month, datediff(month, 0, getdate())-1, 0)

então provavelmente 
WHERE dateColumn >= DATEADD(month, datediff(month, 0, getdate())-1, 0)
  AND dateColumn <  DATEADD(DAY, DATEDIFF(day, 0, getdate()), 1)