The SQL standard specifies that NULL != NULL as NULL represents an unknown value. If you don’t know what the value is you can’t say what it is or isn’t equal too. So I’m pretty sure as far as the DB is concerned your last example is not unique.
The SQL standard specifies that NULL != NULL as NULL represents an unknown value. If you don’t know what the value is you can’t say what it is or isn’t equal too. So I’m pretty sure as far as the DB is concerned your last example is not unique.
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