WHERE tgi.rate=(SELECT 0_tax_types.rate FROM 0_tax_types, 0_tax_groups
WHERE tax_shipping=1 AND tgi.tax_group_id=0_tax_groups.id AND tgi.tax_type_id=0_tax_types.id);
ALTER TABLE `0_tax_groups` DROP COLUMN `tax_shipping`;
+ALTER TABLE `0_tax_group_items` DROP COLUMN `rate`;