This can be done via model's data(). You would subclass QSqlQueryModel and reimplement its data(). Get the data from the base class and add a few checks. When the index is valid and the role is Qt::FontRole, make the font striked out if needed. Notice that there's QFont::setStrikedOut(bool) for that. Also, when the index is valid and the role is Qt::DecorationRole, return a corresponding icon (personal/professional). Otherwise return the value retrieved from the base class. Here's something for you to start with:
Qt Code: 
  1. QVariant MySqlQueryModel::data(const QModelIndex& index, int role) const
  2. {
  3. 	if (!index.isValid())
  4. 		return QVariant();
  5.  
  6. 	QVariant value = QSqlQueryModel::data(index, role);
  7. 	switch (role)
  8. 	{
  9. 		case Qt::FontRole:
  10. 		{
  11. 			QFont font;
  12. 			if (value.isValid())
  13. 				font = qvariant_cast<QFont>(value);
  14. 			if (taskIsDone)
  15. 				font.setStrikedOut(true);
  16. 			return QVariant::fromValue(font);
  17. 		}
  18. 		case Qt::DecorationRole:
  19. 		{
  20. 			...
  21. 			if (professional)
  22. 				return QVariant::fromValue(professionalIcon);
  23. 			else
  24. 				return QVariant::fromValue(personalIcon);
  25. 		}
  26. 		default:
  27. 			return value;
  28. 	}
  29. }
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