mysql 复制数据
1、表存在
insert into table_name(key1,key2) select key3,key4 from table_name_2;
2、表不存在
create table test ( select key1,key2 from table_name );
insert into table_name(key1,key2) select key3,key4 from table_name_2;
create table test ( select key1,key2 from table_name );