Association Sum by key
91428
GroupBy a list of associations with their keys
3674
What is the association bonus, and how does it work?
57986
Sum of products of combinatorials
107680
How do I create a user-defined aggregate function?
25125
Sum over multiple indices
40535
Sum over n variables
112466
Concatenate one-to-many field in single result?
29320
How can I perform this aggregate?
129328
Sum of points and rank according to points
79112
Key-Value-Observing a to-many relationship in Cocoa
136924
How can I get the sum of multiple datetime values?
95919
Rails has_many :through Find by Extra Attributes in Join Model
152146
Pattern matching Association in rules
137984
How do I use "GROUP BY"?
33102
How to put items into grouped arrays where grouped by a particular key
57117
Calculating sum of parts of column based on another column using QGIS Field Calculator?
144532
GROUP BY/SUM from shell