Question

I’m using mongodb at present but i’ve also been accustomed to MySQL.

I’m trying to ponder can we have a dual field index?

For instance imagine this table:

Firstname   | LastName
============+=================    
Bob         | Bob
Bob         | B
John        | Bob

A index where we can have the database enforce uniqueness with both the First Name and Last Name as one (wihout having to have an overhead as a third field as both combined or as a hash or something

so if we were to Enter { 'firstname: 'bob', 'lastname': 'bob'} it wouldn’t insert.

Can mongodb do this?

Answer 1

You can do this in MongoDB through a compound index, like so :

db.col.ensureIndex({Firstname:1, LastName:1}, {unique:true})