mongodb query subset of an array

Question

I have a field _keywords which is an array of strings. I want to get documents of which _keywords are super-set of the query array.

For example

Answer 1

In MongoDb, for array field:

"$in:[...]" means "intersection" or "any element in",
"$all:[...]" means "subset" or "contain",
"$elemMatch:{...}" means "any element match"
"$not:{$elemMatch:{$nin:[...]}}" means "superset" or "in"