排名和分组

Question

我希望我的代码看起来像这样：

 publshrID   BkID_Title    BkID_Title     BkID_Title  BkID_Title
    ----     ----          ------         ------       -------
    9000     1502 Book#1   1301 Book#2    1101 Book#3  1402 Book#4
    9042     1304 Book#1   1201 Book#2    1101 Book#3  1402 Book#4

这是我写的代码

WITH BKS AS(
           SELECT ROW_NUMBER() over(partition by pb.publ_id order by BK.list_price DESC) AS RankN,
           PB.publ_id AS publ,
           CONVERT(varchar(25),book_id)+ ' '+ title AS Main
           FROM bkinfo.publishers AS PB
           INNER JOIN bkinfo.books AS BK ON PB.publ_id = BK.publ_id
           )
SELECT BKS.publ,
       CASE WHEN RankN = 1 THEN MAIN ELSE '' END AS a,
       CASE WHEN RankN = 2 THEN MAIN ELSE '' END AS b,
       CASE WHEN RankN = 3 THEN MAIN ELSE '' END AS c,
       CASE WHEN RankN = 4 THEN MAIN ELSE '' END AS d
FROM BKS

这不太对劲。我究竟做错了什么？

Answer 1

尝试：

WITH BKS AS(
           SELECT ROW_NUMBER() over(partition by pb.publ_id order by BK.list_price DESC) AS RankN,
           PB.publ_id AS publ,
           CONVERT(varchar(25),book_id)+ ' '+ title AS Main
           FROM bkinfo.publishers AS PB
           INNER JOIN bkinfo.books AS BK ON PB.publ_id = BK.publ_id
           )
SELECT BKS.publ,
       max(CASE WHEN RankN = 1 THEN MAIN END) AS a,
       max(CASE WHEN RankN = 2 THEN MAIN END) AS b,
       max(CASE WHEN RankN = 3 THEN MAIN END) AS c,
       max(CASE WHEN RankN = 4 THEN MAIN END) AS d
FROM BKS
GROUP BY BKS.publ