新表已存在
insert into new_table select * from old_table limit 100新表不存在
create table new_table select * from old_table limit 100
insert into new_table select * from old_table limit 100新表不存在
create table new_table select * from old_table limit 100
insert into db1.new_table select * from db2.old_table limit 100新表不存在
create table db1.new_table select * from db2.old_table limit 100