How to execute query with empty fields?

Posted by Kliver Max on Stack Overflow See other posts from Stack Overflow or by Kliver Max
Published on 2012-12-14T10:53:42Z Indexed on 2012/12/14 11:04 UTC
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I have a SQL Query:

SELECT documents.*, t_rights.rights, documents_list.docs
FROM documents 
INNER JOIN t_rights on t_rights.num=documents.type_right 
INNER JOIN documents_list on documents_list.num=documents.document1 
WHERE code_document=1 or code_document=1

In case if i have fields documents.document1 and documents.document1 with some value all works fine. But if this field empty i get empty query result.
Its possible make query like this with empty fields?

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