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INSERT INTO t1 VALUES ('A'),('B'),('A'),('B'),('A'),('B'),(NULL),('a'),('b'),(NULL),('A'),('B'),(NULL);
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SELECT a FROM t1 GROUP BY a;
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SELECT a,count(*) FROM t1 GROUP BY a;
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# Do the same tests with MyISAM temporary tables
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SELECT a FROM t1 GROUP BY a;
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SELECT a,count(*) FROM t1 GROUP BY a;