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Editorial Team
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Asked: 2026-06-02T08:49:57+00:00

Are there any performance gain with this query: UPDATE tbl SET field = 1

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Are there any performance gain with this query:

UPDATE tbl SET field = 1 WHERE field != 1

over this 

UPDATE tbl SET field = 1

Does the SQL parser already know that he doenst’ need to update row that already are field = 1 ?

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1 Answer

  1. Editorial Team

    If there are just a few fields which are != 1, then there are most definitely performance gains in adding the WHERE clause. Even if MySQL did not write the value to disk, it still would need to look at every row to see if it needs to write it or not, but it certainly does not add the WHERE clause by itself.

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