是否有更好的方法在sybase中编写此SQL查询？

问题描述

我有一个存储过程，带有以下查询。基于@range参数，我向where子句添加了更多条件。下面的查询给我正确的结果。我想知道是否可以避免随着范围的增加而重复前面的“ Idx”，“ IdxType”。有没有更好的方法编写此查询？

 SELECT TOP 1 *
    FROM 
        MyTable
    WHERE
    ID1 = @Id1
    and Id1Type = @Id1Type
    and 
    (
        (@range = 2 and ID2 = @Id2 and ID2Type = @Id2Type)
         or
        (@range = 3 and ID2 = @Id2 and ID2Type = @Id2Type 
            and ID3 = @Id3 and ID3Type = @Id3Type)
        or
        (@range = 4 and ID2 = Id2 and ID2Type = @Id2Type 
          and ID3 = @Id3 and ID3Type = @Id3Type
          and ID4 = @Id4 and ID4Type = @Id4Type)
        or
        (@range = 5 and ID2 = @Id2 and ID2Type = @Id2Type 
          and ID3 = @Id3 and ID3Type = @Id3Type
          and ID4 = @Id4 and ID4Type = @Id4Type
           and ID5 = @Id5 and ID5Type = @Id5Type)
    )

解决方法

您可以做的是使用简单的布尔逻辑至少重新组合术语

SELECT TOP 1 *
  FROM 
    MyTable
  WHERE
    ID1 = @Id1 and Id1Type = @Id1Type and
    (@range < 2 or ID2 = @Id2 and ID2Type = @Id2Type) and 
    (@range < 3 or ID3 = @Id3 and ID3Type = @Id3Type) and
    (@range < 4 or ID4 = @Id4 and ID4Type = @Id4Type) and
    (@range < 5 or ID5 = @Id5 and ID5Type = @Id5Type)

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