Sum of a column in QSqlTableModel

[SunnySan]

This example may help

QSqlQuery query;
query.exec("SELECT MAX(id) FROM mytable");
	if (query.next()) {
		myStringResult = query.value(0).toString();
	}
query.finish();

QSqlQuery query;
query.exec("SELECT MAX(id) FROM mytable");
	if (query.next()) {
		myStringResult = query.value(0).toString();
	}
query.finish();

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off course you need to replace the SQL code inside the .exec(_)