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CREATE TEMPORARY TABLE t1 (a int not null, b int, c int, key(b), key(c), key(a,b), key(c,a)) ENGINE=MyISAM;
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INSERT into t1 values (0, null, 0), (0, null, 1), (0, null, 2), (0, null,3), (1,1,4);
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create temporary table t2 (a int not null, b int, c int, key(b), key(c), key(a)) engine=myisam;
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create table t2 (a int not null, b int, c int, key(b), key(c), key(a));
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INSERT into t2 values (1,1,1), (2,2,2);
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alter table t1 ENGINE=MYISAM;