Which is fine, only it might confuse whoever then has to maintain your code.

n is genrally the max though. “From i=0 to n” is used in math all the time.

Or at least run it in the test database first.

Or run your updates/deletes as select first.

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Most websites use them. Smaller file -> less bandwidth -> lower costs.

I assume they wrote it as 5000 and it got changed to 5E3 by the minifier as it saves a byte?