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alter table t1 engine=MYISAM;
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Table Unique Key_name Seq_in_index Column_name
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alter table t1 engine=MyISAM;
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Table Unique Key_name Seq_in_index Column_name
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create temporary table t1 (a int not null, b int not null, c int not null, primary key (a),key(b)) engine=myisam;
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insert into t1 values (3,3,3),(1,1,1),(2,2,2),(4,4,4);