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    <p>I thought it would be useful for me to give you a bit of background information before fully answering your question:</p> <p>When mongo creates an index on a collection it is essentially sorting the collection based on the index key. Thus, when you get the results from a query that uses an index, the results are going to be sorted by key for that index. If your query uses a basic index on field1, then the results are, by definition, sorted on that index.</p> <p>There are a few ways to get around this however. One simple way would be to</p> <p>1) Query on field1</p> <p>2) Sort the result of 1) using field3</p> <p>This would, if I understand your comment correctly, get you your desired output. However, it has the downside of requiring 2 major pieces of work, which could be costly depending on the size of your data.</p> <p>There is another way to solve your problem: compound indexes. Compound indexes use multiple keys to generate an index that is sorted based on both of those keys. There is some documentation here: <a href="http://www.mongodb.org/display/DOCS/Indexes#Indexes-CompoundKeys" rel="nofollow">http://www.mongodb.org/display/DOCS/Indexes#Indexes-CompoundKeys</a> and there are quite a few stack-overflow questions about compound indexes if you want to dive more deeply into the subject.</p> <p>Also, if you want some general info on indexing (and compound indexing) in mongodb check out <a href="http://www.mongodb.org/display/DOCS/Indexing+Advice+and+FAQ#IndexingAdviceandFAQ-1.Thesortcolumnmustbethelastcolumnusedintheindex" rel="nofollow">http://www.mongodb.org/display/DOCS/Indexing+Advice+and+FAQ#IndexingAdviceandFAQ-1.Thesortcolumnmustbethelastcolumnusedintheindex</a>. this whole document should be really useful to you I expect.</p> <p>Using compound indexes, while elegant and appropriate, is definitely more complex than just using sort after a query. If you are willing to spend the time looking into it though I am sure you would find it will help you find a nice solution.</p> <p>Hope this helps!</p>
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