在同一查询中选择多个记录中的最近记录

Question

我的问题与sql select from multiple records only the most recent非常相关，虽然它根本不起作用。

我有一个view，获取成员名称和他们当前的排名数字。 我也有一张表，它发现所有等级名称都大于上述等级号码。

按原样，新视图显示当前成员以及排名标题表中的排名标题>=。

这意味着输出显示每个标题的排名后，而我只想显示第一个（最早）。

我已经尝试了变形例从上面的链接，像这样：

SELECT dbo.vwGetMemberRank.siteMemberId AS ID 
    , dbo.vwGetMemberRank.memberNickname AS Nick 
    , dbo.vwGetMemberRank.siteMemberRankLevel AS currentPoints 
    , dbo.tblSiteMemberRankTitle.siteMemberRankLevel AS neededPoints 
    , dbo.tblSiteMemberRankTitle.siteMemberRankTitle AS rankTitle 
FROM dbo.vwGetMemberRank 
    INNER JOIN dbo.tblSiteMemberRankTitle 
     ON dbo.vwGetMemberRank.siteMemberRankLevel >= dbo.tblSiteMemberRankTitle.siteMemberRankLevel 

WHERE dbo.vwGetMemberRank.siteMemberId IN 
       (
        SELECT MIN(siteMemberId) AS ID 
        FROM dbo.vwGetMemberRank AS vwGetMemberRank_1 
        GROUP BY siteMemberRankLevel 
       ) 

这仍然显示每隔标题。

编辑

vwGetMemberRank

SELECT dbo.tblSiteMemberRank.siteMemberId 
    , dbo.tblSiteMemberRank.siteMemberRankLevel 
    , dbo.tblSiteMemberDetail.memberNickname 
FROM dbo.tblSiteMemberDetail 
    INNER JOIN dbo.tblSiteMemberRank ON dbo.tblSiteMemberDetail.siteMemberId = dbo.tblSiteMemberRank.siteMemberId 

tblSiteMemberRankTitle

CREATE TABLE [dbo].[tblSiteMemberRankTitle](
    [id] [int] IDENTITY(1,1) NOT NULL, 
    [siteMemberRankTitle] [varchar](30) NOT NULL, 
    [siteMemberRankDescription] [varchar](80) NULL, 
    [siteMemberRankLevel] [int] NULL, 
    [thumbnailLocation] [nvarchar](100) NULL, 
CONSTRAINT [PK__tblSiteM__3213E83F1B0907CE] PRIMARY KEY CLUSTERED 
(
    [id] ASC 
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
) ON [PRIMARY] 

Answer 1

可以使用ROW_NUMBER功能来订购你喜欢的任何顺序行列（我用dbo.tblSiteMemberRankTitle.siteMemberRankLevel DESC），然后将结果限制在ROWNUMBER为1，因此只获得最高siteMemberRankLevel行每个SiteMemberID（PARTITION BY）

WITH CTE AS 
( SELECT dbo.vwGetMemberRank.siteMemberId AS ID 
     , dbo.vwGetMemberRank.memberNickname AS Nick 
     , dbo.vwGetMemberRank.siteMemberRankLevel AS currentPoints 
     , dbo.tblSiteMemberRankTitle.siteMemberRankLevel AS neededPoints 
     , dbo.tblSiteMemberRankTitle.siteMemberRankTitle AS rankTitle 
     , RowNumber = ROW_NUMBER() OVER(PARTITION BY dbo.vwGetMemberRank.siteMemberId ORDER BY dbo.tblSiteMemberRankTitle.siteMemberRankLevel DESC) 
    FROM dbo.vwGetMemberRank 
      INNER JOIN dbo.tblSiteMemberRankTitle 
       ON tblSiteMemberRankTitle.siteMemberRankLevel >= dbo.vwGetMemberRank.siteMemberRankLevel 
) 
SELECT ID, Nick, CurrentPoints, NeededPoints, RankTitle 
FROM CTE 
WHERE RowNumber = 1;