带有联合查询的Row_Number()

Question

我有一个SQL查询,它返回具有相同列名的两个表中的行.我需要一个完整结果集中所有记录的行号.

以下是查询

select Id, VersionNumber from documents where id=5 
Union all  
select Id, VersionNumber from versions where id=5
order by VersionNumber desc

应该怎么做？

编辑:如果我只需要返回一个row_num,其中VersionNumber可以说是5.

Answer 1

试试这个:

SELECT *, ROW_NUMBER() OVER(ORDER BY Id) ROW_NUM
  FROM (
        select Id, VersionNumber from documents where id=5 
        Union all  
        select Id, VersionNumber from versions where id=5
       ) a
order by VersionNumber desc

要按版本号5过滤,请使用:

SELECT * 
FROM   (SELECT *, 
               Row_number() OVER(ORDER BY versionnumber DESC, id) row_num 
        FROM   (SELECT id, 
                       versionnumber 
                FROM   documents 
                WHERE  id = 5 
                UNION ALL 
                SELECT id, 
                       versionnumber 
                FROM   versions 
                WHERE  id = 5) a) b 
WHERE  version = 5