[Solved] Concatenate as A and choose either A or B according to their FKs [closed]

by


To do a join and get half a result even if the other record does not exist, use an outer join.

To chose the first non-NULL value of a list, use COALESCE:

SELECT IDowner as IDoutput,
       COALESCE(FirstName || ' '  || LastName, CompanyName) AS Name
FROM Owner
LEFT JOIN Contacts ON Owner.IDcontacts = Contacts.IDcontacts
LEFT JOIN Company  ON Owner.IDcompany  = Company .IDcompany

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solved Concatenate as A and choose either A or B according to their FKs [closed]