Objective C: CoreData and aggregation

Question

Given a CoreData-Entity with an date (days) and an ammount called Transaction. Is it with CoreData possible (and how) to aggregate/group the 'table' (with all Transactions) by Date and calculate the sum of the day in a second column/attribute? (the SQL-Solution would be SELECT date, sum(ammount) FROM transaction GROUP BY date)

Answer 1

They may not do exactly what you want, but since Core Data is fully KVC compliant, take a look at the Key-Value Coding Set and Array operators. This should at least get you pretty close to what you're looking to do.

Answer 2

Stack Overflow: "CoreData equivalent of sum…group by"