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DROP TABLE IF EXISTS t1; CREATE TABLE t1 (a INT, b INT) ENGINE=Aria; INSERT t1 VALUES (3,2004),(2,2006),(1,2007),(3,2008),(2,2005),(2,2001); SELECT GROUP_CONCAT(a) FROM t1 GROUP BY b; GROUP_CONCAT(a) 2 3 2 2 1 3 SELECT DISTINCT GROUP_CONCAT(a) FROM t1 GROUP BY b; GROUP_CONCAT(a) 2 3 1 DROP TABLE t1; CREATE TABLE t1 (a INT, b VARCHAR(1)) ENGINE=MyISAM; INSERT INTO t1 VALUES (7,'q'),(2,NULL),(7,'g'),(6,'x'); SELECT DISTINCT MAX( a ) FROM t1 GROUP BY b ORDER BY MD5( b ); MAX( a ) 2 7 6 DROP TABLE t1;