如何更改 MySQL 列定义?

2021-11-27 00:00:00 mysql alter-table

我有一个名为 test 的 mySQL 表:

I have a mySQL table called test:

create table test(
    locationExpect varchar(120) NOT NULL;
);

我想将 locationExpect 列更改为:

I want to change the locationExpect column to:

create table test(
    locationExpect varchar(120);
);

如何快速完成?

推荐答案

您的意思是在创建表后对其进行更改吗?如果是这样，您需要使用 alter table，特别是:

Do you mean altering the table after it has been created? If so you need to use alter table, in particular:

ALTER TABLE tablename MODIFY COLUMN new-column-definition

例如

ALTER TABLE test MODIFY COLUMN locationExpect VARCHAR(120);

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