Databases don't order rows unless you tell them so
There is no such thing as a "default order" of rows in database tables.
For instance, when you paginate a result set: When using
LIMIT, it is important to use an
ORDER BY clause that constrains the result rows into a unique order. Otherwise you will get an unpredictable subset of the query's rows. You might be asking for the tenth through twentieth rows, but tenth through twentieth in what ordering? The ordering is unknown, unless you specified
In Rails, if you use
Record.last, it will default to ordering by id.
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