# Example database migrations

## Create a table

See [add mentions table](../../../ghost/core/core/server/data/migrations/versions/5.31/2023-01-19-07-46-add-mentions-table.js).

## Add column(s) to an existing table

See [add source columns to emails table](../../../ghost/core/core/server/data/migrations/versions/5.24/2022-11-21-09-32-add-source-columns-to-emails-table.js).

## Add a setting

See [add member track source setting](../../../ghost/core/core/server/data/migrations/versions/5.21/2022-10-27-09-50-add-member-track-source-setting.js)

## Manipulate data

See [update newsletter subscriptions](../../../ghost/core/core/server/data/migrations/versions/5.31/2022-12-05-09-56-update-newsletter-subscriptions.js).