Remarks against duplicate record in data table

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I have a data table it contains some Duplicate row . in Is_duplicate column of datatable i wants to add flag Y.

Suggest me best way.

Can we also filter on combination of Some column.

Posted 13-Oct-13 23:58pm

Sudheer Kumar Tiwari

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thatraja · Answer 1 · 2013-10-14T00:06:00

Solution 1

Go here Editing Data in Datasets[^]

Posted 14-Oct-13 0:06am

thatraja

Herman<T>.Instance · Answer 2 · 2013-10-14T00:20:00

Or you use:
ROW_NUMBER() function

SQL

SELECT *, ROW_NUMBER() OVER (PARTITION BY col1, col2, col3, col4 ORDER BY (SELECT 0)) AS DuplicateRowNumber
FROM table
where DuplicateRowNumber > 1

or you create a CTE object:

SQL

WITH cte AS
(SELECT *, ROW_NUMBER() OVER (PARTITION BY col1, col2, col3, col4 ORDER BY (SELECT 0)) AS DuplicateRowNumber
    FROM table
)
UPDATE cte WHERE DuplicateRowNumber > 1