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Query Has No Return

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Erroneous Code Example

This warning occurs when a query does not have a RETURN statement. While not always an error, queries typically should return a value. 
QUERY getUser(id: ID) =>
    user <- N<User>(id)

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Solution

Add a RETURN statement to specify what the query should return, or use a mutation operation like INSERT, UPDATE, or DROP if the query is intended to modify data without returning a value. 
QUERY getUser(id: ID) =>
    user <- N<User>(id)
    RETURN user