與分頁

Question

對於一個查詢這一個有序的聯合查詢工作正常：

SELECT * 
FROM 
    (SELECT ROW_NUMBER() OVER (ORDER BY id_article DESC) AS RowNum, 
      id_article, 
      article_name, ... 
    FROM articles 
) AS RowConstrainedResult 
WHERE RowNum >=0 
     AND 
     RowNum <= 20 
ORDER BY RowNum 

現在我需要另一個來自同一個表的順序並按照時間聯盟第一查詢和分頁結果。

SELECT articles.id_article AS ID, 
     articles.article_name AS NAME, 
     articles.article_dateNew AS DATE 
FROM articles 
UNION 
SELECT free_arts.id_art AS ID, 
     free_arts.art_name AS NAME, 
     free_arts.art_dateNew AS DATE 
FROM free_arts 
ORDER BY DATE DESC 

Answer 1

SELECT * 
FROM 
(
    Select V1.* , ROW_NUMBER() OVER (ORDER BY DATE DESC) AS RowNum 
    From 
     (
      SELECT articles.id_article AS ID, 
        articles.article_name AS NAME, 
        articles.article_dateNew AS DATE 
      FROM articles 
      UNION -- All 
      SELECT free_arts.id_art AS ID, 
       free_arts.art_name AS NAME, 
       free_arts.art_dateNew AS DATE 
      FROM free_arts    
     ) as V1   
) 
WHERE RowNum >=0 
     AND 
     RowNum <= 20 
--ORDER BY RowNum