How Can I Replicate This SQL Sub Query In Neo4j - subquery

Question

I am new to Neo4j and graph databases, but I have a background in relational databases.
My question a request for advice on how to replicate an SQL Server query efficiently in Neo4j.
I am starting a new project which I think is suited to Neo4j due to a number of friend-of-a-friend type relationships I will have to store. I am using Neo4j 1.8.1 and C# to write my application
One part of my project has a section which has a structure comparable to Twitter, and this is where I need help.
I will use a Twitter analogy to explain my problem:
I have a list of text blobs (tweets) and each blob can be in 0, 1 or many categories (hash tags). Unlike Twitter, I also have users which are linked to 0, 1 or many categories.
I conceive the graph looking something like this:
T = text blob node, C = category node, U = user node
T-------C-------U
\_____/ \_____
/ \ \
T-------C-------U
\_____
\
T-------C-------U
_____/ \_____
/ \
T U
When the application is running, I estimate there will be about 10,000,000 records (I will probably archive any more than this), about 100 categories and about 1000 users.
Currently I have a simple SQL Server database to test this:
__________ ______________ ___________ ______________ ________
|Text | |TextCategory | |Category | |UserCategory | |User |
|----------| |--------------| |-----------| |--------------| |--------|
|TextId |-------|TextId |------|CategoryId |-----|UserId |----|UserId |
|Text | |CategoryId | |Name | |CategoryId | |Name |
|DateAdded | |DateAdded | |-----------| |--------------| |--------|
|----------| |--------------|
By copying the DateAdded field from the Text table to the TextCategory table and adding indexes to the 2 linking tables, I can run the following query to return all text items belonging to a category that a user subscribes to ordered by date:
SELECT t.*
FROM Text t
INNER JOIN tc TextCategory ON tc.TextId = b.TextId
WHERE tc.CategoryId IN
(
SELECT CategoyId
FROM UserCategory
WHERE UserId = #UserId
)
ORDER BY tc.AddedDate
In reality I would page the results but for simplicity, I have left this out.
How can I replicate this query in my Neo4j database efficeintly? Is a sub query like this possible in Cypher?
If I used something like this:
u-[:SUBSCRIBES_TO]->c<-[:BELONGS_TO]-t
(My Cypher skills are still quite infantile)
I could scan through the text nodes but I would not be able to use an index on the user. I would end up checking each text node to see if it was linked to the user.
If I scanned through all relationships linked to a user, I would not be able to take advantage of the date ordering index on the text nodes to page results avoid scanning all nodes to find the 10 earliest for example.
As I have mentioned I come from an RDBMS background and I am still thinking about this in a relational database way, so if I am wrong in my theories please let me know.

Answer 1

I think this translates quite directly to neo.
You could put the user nodes in an index and then query like you already stated:
start u=users(<USERID>) match u-[:SUBSCRIBES_TO]->c<-[:BELONGS_TO]-t return t order by t.AddedDate skip(<SKIPPED>) limit(<PAGESIZE>)
Unless i missed something you answered it already.