注意是()mysql> create table president
-> (
-> last_name varchar(15) not null,
-> first_name varchar(15) not null,
-> suffix varchar(5) not null,
-> city varchar(20) not null,
-> state varchar(2) not null,
-> birth date not null,
-> death date null
-> )
-> ;
-> (
-> last_name varchar(15) not null,
-> first_name varchar(15) not null,
-> suffix varchar(5) not null,
-> city varchar(20) not null,
-> state varchar(2) not null,
-> birth date not null,
-> death date null
-> )
-> ;
解决方案 »
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