Cosmos DB - Select root document based on child data - azure-cosmosdb

Question

Sorry if this is a newbie question, but I am a newbie to Cosmos DB.
I am trying to select all the root documents from my collection where there a child element matches specified (multiple) criteria.
Lets assume you have an ORDER document, which has ORDERITEMS as sub-data document, what I need to do is to query all the orders where a particular product has been ordered, and to return the whole order document.
[
{
"order": {
"id": "1",
"orderiems": [
{
"partcode": "A",
"qty": "4"
},
{
"partcode": "B",
"qty": "4"
},
{
"partcode": "C",
"qty": "4"
}
]
}
},
{
"order": {
"id": "2",
"orderiems": [
{
"partcode": "A",
"qty": "4"
},
{
"partcode": "B",
"qty": "4"
},
{
"partcode": "A",
"qty": "4"
}
]
}
},
{
"order": {
"id": "3",
"orderiems": [
{
"partcode": "A",
"qty": "1"
}
]
}
}
]
My query is
SELECT order from order
JOIN items in order.orderitem
WHERE item.partcode = '<mypartcode>
AND item.qty > 1
Now, this sort of works and returns me the orders, but it is returning
id: 1
id: 2
id: 2 << repeated
because id: 2 has two of the same item.... id: 3 excluded because it's only 1 item
In normal SQL Server SQL I would simply have
SELECT *
from Orders o
where exists (select 1
from OrderItems oi
where oi.ordID = o.ID
and oi.partcode = 'A'
and oi.qty > 1)
How can I stop the duplication please
Please note that the above is a hand-crafted representation to simplify the problem as the document model I am actually working on a extremely large

Answer 1

Cosmos DB now supports the DISTINCT keyword and it will actually work on document use cases such as yours.

Answer 2

With the current version of the Azure Cosmos DB SQL API you can use some of these:
SELECT distinct VALUE order
FROM order
JOIN item in order.orderitems
WHERE item.partcode = '<Partcode>'
AND item.qty > 1
Or:
SELECT order
FROM order
WHERE EXISTS (
SELECT NULL
FROM item IN order.orderitems
item.partcode = '<Partcode>'
AND item.qty > 1
)