单选题

假如tableName_2表有30亿条数据，下列哪条语句执行效率最快

Question

A. 以下回答都正确

B. insert into tableName_1 select * from tableName_2，tableName_1表ID字段为主键

C. create table tableName_1 select * from tableName_2

D. delete from tableName_2