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