Gediminas Ć edbaras Gediminas Ć edbaras - 3 months ago 24
MySQL Question

Changing generated column to not-generated in MySQL table

I've created a MySQL table that contains a generated column:

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


How do I change
aggregate_version
to be a non-generated column? The column type should stay the same.

Answer Source

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.

...

Try:

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

See db-fiddle.