select * into Persons_backup from Persons这种方式在mysql运行会报 Undeclared variable错误
create table persons_backup(select *from persons)
insert into persons_backup(a,b,c)select a,b,c from persons where id_p=6;
insert into mvc.users(name,address) select name,address from ajax.userajax;
create table ajax.persons_(select *from persons);
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