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col5 enum('PENDING', 'ACTIVE', 'DISABLED') not null,
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col6 int not null, to_be_deleted int);
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insert into t1 values (2,4,3,5,"PENDING",1,7);
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18
add column col4_5 varchar(20) not null after col4,
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add column col7 varchar(30) not null after col5,
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add column col8 datetime not null default '1000-01-01 00:00:00', drop column to_be_deleted,
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21
change column col2 fourth varchar(30) not null after col3,
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modify column col6 int not null first;