With the COLLATE clause you can override whatever the default collation is for a comparison. COLLATE may be used in various parts of SQL queries. Here are some examples:
With ORDER BY:
SELECT k FROM t1 ORDER BY k COLLATE latin1_german2_ci;
With AS:
SELECT k COLLATE latin1_german2_ci AS k1 FROM t1 ORDER BY k1;
With GROUP BY:
SELECT k FROM t1 GROUP BY k COLLATE latin1_german2_ci;
With aggregate functions:
SELECT MAX(k COLLATE latin1_german2_ci) FROM t1;
With DISTINCT:
SELECT DISTINCT k COLLATE latin1_german2_ci FROM t1;
With WHERE:
SELECT * FROM t1 WHERE _latin1 'Müller' COLLATE latin1_german2_ci = k;
With HAVING:
SELECT k FROM t1 GROUP BY k HAVING k = _latin1 'Müller' COLLATE latin1_german2_ci;