mysql - 将 MySQL 表中的生成列更改为非生成列

Question

我创建了一个包含生成列的 MySQL 表:

CREATE TABLE `messages` (
    `metadata` JSON NOT NULL,
    `aggregate_version` INT(11) UNSIGNED GENERATED ALWAYS AS (metadata->'$._aggregate_version') STORED NOT NULL
);

如何将 aggregate_version 更改为非生成列？列类型应保持不变。

Answer 1

13.1.8.3 ALTER TABLE and Generated Columns

...

• Stored but not virtual generated columns can be altered to nongenerated columns. The stored generated values become the values of the nongenerated column.

...

尝试:

ALTER TABLE `messages`
MODIFY `aggregate_version` INT UNSIGNED NOT NULL;

参见db-fiddle .