How to set text alignment on a column of QTableView programmatically?

The alternative to subclussing QItemDelegate is to subclass your model and override data() method.

QVariant MyModel::data(const QModelIndex& index, int role) const {
    if (index.column() == yourCellIndex && role == Qt::TextAlignmentRole) {
        return Qt::AlignLeft;
    } else {
        return QVariant();
    }
}

QSqlTableModel *model2= new QSqlTableModel();

model2->setTable("Save");
model2->select();

QSortFilterProxyModel *proxy1=new QSortFilterProxyModel();
proxy1->setSourceModel(model2);

QStandardItemModel *modd=new QStandardItemModel();

for (int z =0; z< proxy1->rowCount(); ++z)
   {
    for (int y =0; y< proxy1->columnCount(); ++y)
        {
        QStandardItem *item= new QStandardItem();
        item->setText(proxy1->index(z,y).data().toString());
        item->setTextAlignment(Qt::AlignCenter);
        modd->setItem(z,y,item);

        }
  }
ui->tableView->setModel(modd);