Question

以下是查询：

select a.*
from customers a INNER JOIN
     (SELECT city,M IN(id) as id
      FROM customers
      GROUP BY city
     ) b
     ON a.city = b.city AND a.id = b.id;

我有一个不时动态的列表。但为了更好地理解，我正在提供样本。

order_field = ['check-in', 'check-out ASC',.....]

此order_field的设置取决于用户从UI中选择逐个选项。在这里，我将所有传入的字段与我的列名称映射到数据库中。

Note: ASC for ascending. This could be like DESC also

然后我如何通过动态拟合order_field上的字段的结果获得订单。

有任何想法吗？

Answer 1

试试这个。我在sql声明了order字段。

DECLARE @order_field varchar(15)
SET @order_field = 'DESC '

a.*
from customers a INNER JOIN
 (SELECT city,M IN(id) as id
  FROM customers
  GROUP BY city
 ) b
 ON a.city = b.city AND a.id = b.id;
 ORDER BY  CASE WHEN @order_field ='ASC' THEN a.city END,
           CASE WHEN @order_field ='DESC' THEN a.city END DESC

Python：如何动态地对RawQuery集进行排序

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