SQL存储过程重复记录

Question

假设我有重复的记录，我想在第一个记录中添加1，为所有重复的记录添加0，如何实现呢？ ？

Answer 1

喜欢吗？

UPDATE t1
SET [Column1] = IIF(sub.[RowNumber] = 1, 1, 0)
FROM Table1 AS t1
    INNER JOIN (
        SELECT [ID], ROW_NUMBER() OVER(PARTITION BY [Column2] ORDER BY [ID]) AS [RowNumber]
        FROM Table1
    ) AS sub
        ON sub.[ID] = t1.[ID];

--[Column1] For Update
--[Column2] Your Duplicates