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link to "Schema migration" Wikipedia page. Closes #14479. [ci skip]

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Yves Senn 2014-03-26 09:06:31 +01:00
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guides/source/migrations.md
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@ -18,9 +18,10 @@ After reading this guide, you will know:
Migration Overview
------------------
Migrations are a convenient way to alter your database schema over time in a
consistent and easy way. They use a Ruby DSL so that you don't have to write
SQL by hand, allowing your schema and changes to be database independent.
Migrations are a convenient way to
[alter your database schema over time](http://en.wikipedia.org/wiki/Schema_migration)
in a consistent and easy way. They use a Ruby DSL so that you don't have to
write SQL by hand, allowing your schema and changes to be database independent.
You can think of each migration as being a new 'version' of the database. A
schema starts off with nothing in it, and each migration modifies it to add or