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Meaning of an equals sign in double quotes in the WHERE part


webcrab
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I was looking through this: https://www.w3schools.com/sql/sql_injection.asp and it says that ""="" in the WHERE part of any SQL statement evaluates to True. I don't understand why that happens, though, but I can get the same result set by providing an arbitrary integer instead of ""="". Can someone break this down for me please?

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