The problem is that Qt uses inner join and you want to use outer join, so instead you can use QSqlTableModel (if you have a view) or QSqlQueryModel. In the latter case the model won't be editable and with view it depends on the underlying DBMS.
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Re: setRelation and NULL in ID
The problem is that Qt uses inner join and you want to use outer join, so instead you can use QSqlTableModel (if you have a view) or QSqlQueryModel. In the latter case the model won't be editable and with view it depends on the underlying DBMS.
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