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create table t1 (a int not null auto_increment, primary key (a), t timestamp null, c char(10) default "hello", i int);
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insert into t1 values (default,default,default,default);
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insert into t1 values (default,default,default,default);
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insert into t1 values (4,0,"a",5);
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insert into t1 values (default,default,default,default);
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select a,t is not null,c,i from t1;