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websssFlag for Kenya

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delete duplicate data

I need to delete duplicate data
i.e. if i have 2 rows exactly the same, delete one of the rows

I have a table called Tbl_Data
It has these columns

ID
GPSDateTime (datetime)
ReportID (int)
DeviceID (int)

If all 3 columns match data (except ID) I want to delete one of the rows so i'm left with unique data rows instead duplicates

how might i Do this?
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Scott Pletcher
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ASKER

Thanks Scott

I'm getting the errror:

Msg 4112, Level 15, State 1, Line 2
The function 'ROW_NUMBER' must have an OVER clause with ORDER BY.
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ASKER

Got it thanks
Yeah, sorry, I left out the ORDER BY, which must appear, even if it's meaningless:

;WITH cte_dups AS (
    SELECT *, ROW_NUMBER() OVER(PARTITION BY GPSDateTime, ReportID, DeviceID ORDER BY GPSDateTime) AS row_num
    FROM Tbl_Data
)
DELETE FROM cte_dups
WHERE row_num > 1