How to efficiently fetch one column using CoreData

I have a Table with 50,000 records (table has 8 columns). I need to display only 开发者_运维问答1st column on the Table. I need an array which contains all data from Table only from 1st column. How to use NSFetchRequest to get all record from 1st column of the Table using Core Data?

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You need to use setPropertiesToFetch: method like

[request setPropertiesToFetch :[NSArray arrayWithObject:@"<#Attribute name#>"]];

e.g.,

[fetchRequest setPropertiesToFetch:[NSArray arrayWithObjects:@"ColName", nil]];

Refer link