ActiveRecord group by multiply field and count
103108
Applying aggregate function SUM together with GROUP BY
62300
Mysql count instances of substring, then order by
79298
Recalculate a Field with data from another field, ignoring NULL values
155343
Select multiple (non-aggregate function) columns with GROUP BY
91428
GroupBy a list of associations with their keys
61001
Get rows product (multiplication)
26055
Multiplication by $0$ in a field
157105
Pivot, categorize and group by
141778
LINQ - Left Join, Group By, and Count
55747
Grouping functions (tapply, by, aggregate) and the *apply family
74036
Count the occurrences of DISTINCT values
24775
MySQL Group_Concat Repeating Values
140337
Using an aggregate function in where
78567
How calculate sequential values based on group field?
89385
How do I use T-SQL Group By
129322
Many To many for Bulk records
93921
Select groups based on number of unique / distinct values