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Will SQL update a record if there is no change to the record?
For examople, is it more efficient to replace
UPDATE TABLE myTable
Set Col1 = ISNULL(Col1,'')
...
Set Col100 = ISNULL(Col30,'')
with
UPDATE TABLE myTable
Set Col1 = ISNULL(Col1,'')
...
Set Col100 = ISNULL(Col30,'')
WHERE
Col1 IS NULL OR
...
Col30 IS NULL
Yes, it will attempt overwrite.