All three number rows within a partition and they disagree about ties, which is invisible in test data where nothing ties and obvious in production where everything does.…
A value derived from other columns is usually maintained by application code or a trigger, and both drift. A generated column is computed by the server and cannot…
MySQL used to allow selecting a column that is neither grouped nor aggregated, returning an arbitrary row’s value for it. 5.7 turns that off by default, and every…