Re: what database schema version management system to use?

John R Pierce wrote:
> On 4/6/2016 3:55 AM, Alexey Bashtanov wrote:
>> I am searching for a proper database schema version management system.
>
>
> At my $job we're old school. our schemas are versioned. there's a
> settings table with (setting TEXT, value TEXT) fields, a row in that is
> ('version', '1.0') or whatever.
>
> each new release of the schema is released as a .SQL file which builds
> the full schema from scratch, and a .SQL file which updates the previous
> version to the new version. the full build and update .sql files are
> kept in our source code control along with the rest of our software.
> we're quite careful about how we modify our schema so it can be done
> online, update the schema on the live database, then update and restart
> the application/middleware.
>

I would be interested in knowing specifically how the ".SQL file which
updates the previous version to the new version" is generated. Is there
a tool that does that based on the difference between new and old? Or is
that update script coded by hand?