如何在mysql中更改列标题，例如sum（FREQ）到FREQ？

Question

我做了

create table A as select sum(FREQ) from B;

所以我得到了带有字段名称总和（FREQ）的表A.我尝试使用以下代码更改列标题：

alter table A change sum(FREQ) FREQ bigint;

但它无效

我该怎么办？

Answer 1

只需在选择列表中提供别名FREQ：

create table A as select sum(FREQ) as FREQ from B;

Answer 2

试试这个

alter table A change column `sum(FREQ)` FREQ bigint;