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UPDATE changes the values of the specified columns in all rows that satisfy the condition. Only the columns to be modified need be mentioned in the SET clause; columns not explicitly modified retain their previous values.

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When updating in SQL Sever, it is my understanding that the entire row is deleted and then recreated (which is why you get a new timestamp). So then, if you update 1 field or 500 fields, does the … performance of the update change? I suspect that if there are indexed columns, as it has to update the index, there would be more "work" for the server to perform. When answering, assume that there are no triggers. …
asked Jan 13 '14 by Dan Andrews