Question

我正在尝试在H2中对重复行进行排名。由于H2不支持像RANK()这样的窗函数。我正在尝试使用Row_Number()，但它不起作用会抛出错误说法语错误。请指导有什么问题。我是SQL和H2数据库的新手。

Insert into t2(c1, c2, c3, rank1, rank2) 
   select 
      c1, c2, c3,
      ROW_NUMBER OVER(partition by c1 order by c3) as rank1,
      ROW_NUMBER OVER(partition by c2 order by c3) as rank2
from t1

请指导。提前致谢。如何解决上述语法错误？它说 ; ）预期。另外，请让我知道好的解决方法，以便在H2数据库中找到排名。

Answer 1

尝试用带有COUNT（）的子查询替换ROW_NUMBER（）。唯一的问题是他们将为相同的C3字段生成相同的排名。

   select 
      c1, c2, c3,

      (SELECT COUNT(*) FROM T1 as T3 WHERE T3.C1=T1.C1 AND T3.C3<=T1.C3 ) as rank1,
      (SELECT COUNT(*) FROM T1 as T3 WHERE T3.C2=T1.C2 AND T3.C3<=T1.C3 ) as rank2
   from t1

HOW中的ROW_NUMBER（）无法正常工作

1 个答案: