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create table t1 (a int, b int, c int, d int, e int, f int, g int, h int,i int, primary key (a,b,c,d,e,f,g,i,h)) engine=MyISAM;
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insert into t1 (a) values(1);
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show table status like 't1';
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alter table t1 modify a int;
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show table status like 't1';
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create table t1 (a int not null default 0, b int not null default 0, c int not null default 0, d int not null default 0, e int not null default 0, f int not null default 0, g int not null default 0, h int not null default 0,i int not null default 0, primary key (a,b,c,d,e,f,g,i,h)) engine=MyISAM;
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insert into t1 (a) values(1);
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show table status like 't1';