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No it's not a union.
You need to decide the relationship between the two tables. If only one user can ever be the author of a document, you just need a column in the document table containing the user id of that user.
If more than one user can contribute to a document you need a relational table. This would be another table with two columns, one for the document id and another for the user id. You add a row in this table for each user who contributed to each document. This allows you to have as many relationships between users and documents as necessary.
You then pull out the data with two joins statements in your query.
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