antirez/redis — pull request #225 by idaunis (2011-12-01 14:52:49+00:00)
Title: Support for Multiple BY patterns in SORT Command

With this feature Redis will expand the applications in numerous scenarios where right now can only be performed in an SQL-like environment.

**Usage**
SORT key [BY pattern [ASC|DESC] [ALPHA] [BY pattern…]] [LIMIT offset count] [GET pattern [GET pattern ...]] [STORE destination]

**Documentation**
The BY option can be used multiple times in order to sort by multiple fields. If the list elements have the same value when ordering by the first BY pattern, then it sorts by the second BY pattern and so on.

The following example will order the list mylist by weight and by title. Sorting first the list of elements by weight, and then by title when the elements have the same weight:

SORT mylist BY weight_* BY title_* ALPHA