"Month" is a reserved word and shouldn't be used for object names. Plus it is not descriptive.... "Month" of what???
Shouldn't use spaces in object names.
Does the data really have an underscore in the data? ......-> Like "*Plan_Detail*"
There is a opening brace instead of an opening bracket in the FROM clause.....-> FROM {Data Feed]
Code:
SELECT [Data Feed].Month, [Data Feed].[Exit Links], [Data Feed].Visits
FROM {Data Feed]
GROUP BY [Data Feed].Month, [Data Feed].[Exit Links], [Data Feed].Visits
HAVING ((([Data Feed].[Exit Links]) Like "*Plan_Detail*"));