Does mongodb support operations across sets (that is, across tables)? ?

  mongodb, question

Does mongodb support cross-collection operations? Or is there a type of replacement? ?

Not directly supported

http://docs.mongodb.org/manual/reference/database-references/

When there is such a demand, first consider whether it can be embedded or not, and then consider whether the real relational database cannot meet it.

In addition, when there is an index, the data can be obtained by reference, and the speed is also acceptable, i.e. it is rather tedious to write code myself.