I am using Azure DocumentDB. I only have one collection with heterogenous document types. I am using a type parameter to distinguish between different document types. I am making use of their SQL-like query language to get documents as follows:
SELECT * FROM Collection c WHERE c.ID = 123
I am getting my connection information, including the Endpoint URI, AuthKey, Database name and Collection name, from a configuration file. It seems like I can use any value for "Collection c" and it essentially just becomes an alias for the whole collection. So what is the point of the FROM section of my query?
I think you already got it :)
FROM allows you to set an alias to refer to the collection in other clauses. This may make more sense to you when you include multiple references (e.g. using a JOIN to form a cross-product with nested array elements).
For example:
SELECT food.description, tag.name
FROM food
JOIN tag IN food.tags
WHERE food.id = "09052"
In the query above, we are using referencing both the collection as well as nested array elements within a projection.
You can try this query out on the query demo website.
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