Question

排序依据是动态的，但排序顺序是静态的。

SELECT ...
Order By CASE WHEN InputParam = 'PRICE' THEN OFFER_PRICE END DESC,
         CASE WHEN InputParam = 'ENDING SOON' THEN EXPIRY_DATE END DESC, 
         CASE WHEN InputParam = 'DISCOUNT' THEN DISC_PERCENTAGE END DESC,
         CASE WHEN InputParam = 'SAVING' THEN SAVING END DESC

现在我需要确保排序顺序也是动态的。有没有办法在上面的查询中使排序顺序动态化？

Answer 1

如果您还想使排序顺序（ASC / DESC）动态化，您可以执行以下操作：

SELECT ...
Order By CASE WHEN InputParam = 'PRICE' THEN l_so * OFFER_PRICE END,
         CASE WHEN InputParam = 'ENDING SOON' 
              THEN l_so * (SYSDATE - EXPIRY_DATE) END, 
         CASE WHEN InputParam = 'DISCOUNT' THEN l_so * DISC_PERCENTAGE END,
         CASE WHEN InputParam = 'SAVING' THEN l_so * SAVING END

变量l_so包含1或-1，具体取决于您想要的排序顺序。

Answer 2

这对我有用：

order by 
  case when :dir_param = 'ASC' then
    case :col_param 
      when 'col_1_identifier' then col_1_name
      when 'col_2_identifier' then col_2_name
      ...
    end
  end,
  case when :dir_param = 'DSC' then
    case :col_param 
      when 'col_1_identifier' then col_1_name
      when 'col_2_identifier' then col_2_name
      ...
    end
  end desc

或

order by 
case when :dir_param = 'ASC' and :col_param = 'col_1_identifier' then col_1_name end,
case when :dir_param = 'DSC' and :col_param = 'col_1_identifier' then col_1_name end desc,
case when :dir_param = 'ASC' and :col_param = 'col_2_identifier' then col_2_name end,
case when :dir_param = 'DSC' and :col_param = 'col_2_identifier' then col_2_name end desc

将文字，变量和列名称替换为您的具体情况。对于desc排序方向限定符的放置，Oracle似乎非常挑剔。

Oracle动态DESC和ASC按顺序排列

2 个答案: