php - 无法在 zf2 中使用范围添加分组依据

Question

我在 zend Framework 2 中有一个不工作的查询，它显示未知列我的查询

$select = new Select('dining_table_reservation');
        $select->columns(array('range'=>new \Zend\Db\Sql\Expression("CONCAT(5*floor(dining_table.SeatingCapacity/5),'-',5*floor(dining_table.SeatingCapacity/5) + 5)"),'Avgtime'=>new \Zend\Db\Sql\Expression('avg(timestampdiff(SECOND, '.$dtr.'.StartTime, '.$dtr.'.EndTime))')));
        $select->join($dt, "$dtr.TableId=$dt.TableId", array('SeatingCapacity'),'INNER');
        $select->group(1);
        $select->order($dt.'.SeatingCapacity');

我的查询外观

SELECT CONCAT(5*floor(dining_table.SeatingCapacity/5),'-',5*floor(dining_table.SeatingCapacity/5) + 5) AS "range", avg(timestampdiff(SECOND, dining_table_reservation.StartTime, dining_table_reservation.EndTime)) AS "Avgtime", "dining_table"."SeatingCapacity" AS "SeatingCapacity" FROM "dining_table_reservation" INNER JOIN "dining_table" ON "dining_table_reservation"."TableId"="dining_table"."TableId" GROUP BY "1" ORDER BY "dining_table"."SeatingCapacity" ASC

显示错误:

"Statement could not be executed (42S22 - 1054 - Unknown column \u00271\u0027 in \u0027group statement\u0027)"

我该怎么办？

Answer 1

数据库中的表中没有第 1 列，需要为分组依据设置存在列。你能展示一下你的数据库结构吗？