i'm trying to get data of 30 minutes ago to now.. any idea with the query

SELECT DateDiff("n",Now(),[TimeStamp]) AS [Time]
FROM RIMData_RAW
GROUP BY DateDiff("n",Now(),[TimeStamp])
HAVING ((Now()>30));
SELECT DateDiff("n",Now(),[TimeStamp]) AS [Time]
FROM RIMData_RAW
where DateDiff("n",Now(),[TimeStamp]) > 30
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