It is, of course, generally considered more natural to make equality primary, not inequality, but that symbol that MySQL uses for NULL-safe equality, <=>, looks much more like inequality than equality. Furthermore, I find that in my code I am far oftener interested in NULL-safe _in_equality than equality. If I write IF A = B THEN then if one is NULL and the other not, and the code is such that never are both NULL, well, for my purpose they are not equal: so good. But if I write IF A <> B THEN often I want it NULL-safe, for if one is NULL and the other not, I want that true--and MySQL s symbol for NULL-safe equality looks just right for inequality.
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