Question

嗨，如果对此的答案是在其他地方我很抱歉。我环顾四周，看不出简单的解决方案。我有一个想要运行的查询。我不关心联合集的顺序，只是内部查询返回正确的数据，这是“最大的区域”。

(SELECT TOP 5 * FROM [geo].[Areas] WHERE CountryID = @CountryID AND (TypeID = 'City')
ORDER BY [ShapeArea] DESC) as BiggestCities
    UNION ALL
(SELECT TOP 5 * FROM [geo].[Areas] WHERE CountryID =  @CountryID AND (TypeID = 'National park')
ORDER BY [ShapeArea] DESC) as BiggestParks

但是T-sql不会让我对子查询有ORDER BY，只对整个联盟...帮助赞赏！我真的不想创建临时表或类似的东西。

Answer 1

试试这个

SELECT * 
  FROM (SELECT TOP 5 * 
          FROM [geo].[Areas] 
         WHERE CountryID = @CountryID 
           AND (TypeID = 'City')
      ORDER BY [ShapeArea] DESC) as BiggestCities
UNION ALL
SELECT * 
  FROM (SELECT TOP 5 * 
          FROM [geo].[Areas] 
         WHERE CountryID =  @CountryID 
           AND (TypeID = 'National park')
      ORDER BY [ShapeArea] DESC) as BiggestParks

Answer 2

SELECT t.* /* Excluding RowNum */
  FROM (SELECT *, ROW_NUMBER() OVER (PARTITION BY TypeID ORDER BY [ShapeArea] DESC) as RowNum
          FROM [geo].[Areas]
          WHERE CountryID = @CountryID 
            AND TypeID IN ('City', 'National park')
       ) t
  WHERE t.RowNum <= 5

每个需要ORDER BY子句的子查询的Tsql联合

2 个答案: