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All versions of Microsoft SQL Server (not MySQL). Please also add a version-specific tag, like sql-server-2016, since it is often relevant to the question.

13 votes
5 answers
128k views

Update existing rows with squence number/char or any unique data

I added a new column in the Table X This column "cn" has to be unique and mandatory, but old data don't have any value. How to update the existing records with sequecely or random unique data? Than …
med_alpa's user avatar
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