Slight clarification: I don't know about other RDBMS products, but in MySQL's case, the sorting is only dependent on the column's collation, which is easy to find with SHOW FULL COLUMNS. If my tool discovers that the two columns have different collations, I think it will have to die with an error.

In reply to Re^2: locales, encodings, collations, charsets... how can I match a given MySQL collation? by xaprb
in thread locales, encodings, collations, charsets... how can I match a given MySQL collation? by xaprb

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