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Editorial Team
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Asked: 2026-05-25T00:09:02+00:00

Let’s say I have a Database with 3 tables: Keywords , Documents , and

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Let’s say I have a Database with 3 tables: Keywords, Documents, and KeywordDocuments. KeywordDocuments has only 3 columns, KeywordDocumentID, KeywordID, and DocumentID.

The relationship between Documents and KeywordDocuments is the same as Keywords and KeywordDocuments, i.e. one-to-many.

Watching Julie Lerman’s video on EF, she said that we don’t need KeywordDocuments’s entity in the model. How do I eliminate that entity while making sure that in the relationship will be respected in the underline database?

Thanks for helping

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1 Answer

  1. Editorial Team

    Remove the KeywordDocumentID column from the KeywordDocument table. It will then contain only the foreign key columns from the tables for which it represents a many to many relationship.

    Create a new composite primary key on the KeywordDocument table which includes both the KeywordID and the DocumentID columns. This will replace the original primary key that you had on the KeywordDocumentID column – that key would have been deleted along with the column.

    A table such as this will not result in an entity being generated in the model. Rather, both of the other entities (Keyword and Document in this case) will have navigation properties based on EntityCollection. Document will have a collection of Keywords and vice verca.

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