So, if we would define that the key entry "0-NULL-Whatever" equals "0-NULL-Whatever" (which MySQL is capable of if you look at the definition of UNIQUE indexes with BDB tables) then allowing NULLs as part of a key entry would not permit duplicate entries. At least not more than allowing other values.
You cannot "define" that those keys are equal, because SQL standard states that "0-NULL-Whatever" is *always* *not-equal* to "0-NULL-Whatever".
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