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MongoDB RelationshipMongoDB relationships represent the logical interconnectedness of multiple documents.Links can be established between documents through embedding and referencing.the relationships in MongoDB can be: 1:1 (1 to 1) 1:n (1 to many) N:1 (multi-pair 1) N /A (many-to-many) A user can have multiple addresses, so it is a one-to-many relationship.The following is a simple structure of the user documentEmbedded relationshipsUsing the embedded method, we

not executed SELECT from WHERE inch (SELECT from B) Not EXISTS = No in, same meaning but slightly different in syntax SELECT from WHERE not inch (SELECT from B) The usage and differences of In,not in,exists,not EXISTS in sql: in: Determines whether the given value matches the value in the subquery or list. The In keyword allows you to select a row that matches any of the values in the list. The following query is required when you want to obtain the names and state lists of all authors resi