如何编辑这个 mssql 查询？答案

【问题标题】：How to edit this mssql query?如何编辑这个 mssql 查询？
【发布时间】：2013-09-12 18:45:50
【问题描述】：

下面这个查询与我的氏族排名 php 脚本相关联。

SELECT TOP 100 
  IDNum, 
  IDName, 
  Nation, 
  (SELECT SUM(LoyaltyPoint) 
   FROM USERDATA 
   WHERE USERDATA.Knights = KNIGHTS.IDNum 
     AND USERDATA.Authority IN(1, 2)) as ClanLoyalty 
FROM KNIGHTS 
ORDER BY ClanLoyalty DESC

我想为 MannerPoint 添加第二条规则作为忠诚度的附加规则。因此，它将同时显示礼仪和忠诚度积分并按两者排序。

例如如果氏族有10000忠诚度和100礼仪，那么它的排名会高于20000忠诚度和50礼仪。

我尝试了一些但失败了。如果有人愿意帮助我，将不胜感激。

编辑：我试过了： SELECT TOP 100 IDNum, IDName, Nation, (SELECT SUM(LoyaltyPoint) FROM USERDATA WHERE USERDATA.Knights = KNIGHTS.IDNum AND USERDATA.Authority IN(1, 2)) as ClanLoyalty, (SELECT SUM(MannerPoint) FROM USERDATA WHERE USERDATA.Knights = KNIGHTS.IDNum AND USERDATA.Authority IN(1, 2))) as MannerPoint FROM KNIGHTS ORDER BY ClanLoyalty DESC, MannerPoint DESC

但它根本不显示。

【问题讨论】：

对于初学者，您需要指定存储方式点的位置
它们在 USERDATA 中与忠诚度积分相同。
在您的主选择语句中，为方式点添加另一个返回列并将其包含在您的订单中。例如，选择 [existingColumn]，（选择方式）作为 MannerPoint from ... where .. . order by MannerPoint desc, ClanLoyalty DESC
SELECT TOP 100 IDNum, IDName, Nation, (SELECT SUM(LoyaltyPoint) FROM USERDATA WHERE USERDATA.Knights = KNIGHTS.IDNum AND USERDATA.Authority IN(1, 2)) as ClanLoyalty, (SELECT SUM(MannerPoint) FROM FROM USERDATA WHERE USERDATA.Knights = KNIGHTS.IDNum AND USERDATA.Authority IN(1, 2))) as MannerPoint FROM KNIGHTS ORDER BY ClanLoyalty DESC, MannerPoint DESC 喜欢吗？这完全正确吗？
是的，没错

标签： php sql sql-server

【解决方案1】：

您可以使用外部应用对LoyaltyPoint 和MannerPoint 求和：

select top 100
    k.IDNum, 
    k.IDName, 
    k.Nation, 
    u.ClanLoyalty,
    u.ClanManner 
from KNIGHTS as k
    outer apply (
        select
            sum(u.LoyaltyPoint) as ClanLoyalty,
            sum(u.MannerPoint) as ClanManner
        from USERDATA as u
        where u.Knights = k.IDNum and u.Authority in (1, 2)
    ) as u
order by u.ClanManner desc, u.ClanLoyalty desc

或简单的子查询：

select top 100
    k.IDNum, 
    k.IDName, 
    k.Nation, 
    u.ClanLoyalty,
    u.ClanManner
from KNIGHTS as k
    left outer join (
        select
            u.Knights,
            sum(u.LoyaltyPoint) as ClanLoyalty,
            sum(u.MannerPoint) as ClanManner
        from USERDATA as u
        where u.Authority in (1, 2)
        group by u.Knights
    ) as u on u.Knights = k.IDNum
order by u.ClanManner desc, u.ClanLoyalty desc

不知道你想如何排序你的记录，如果你想按 ClanManner 和 ClanLoyalty 的总和排序，你可以这样做：

order by isnull(u.ClanManner, 0) + isnull(u.ClanLoyalty, 0) desc

【讨论】：

【解决方案2】：

这个：

SELECT TOP 100 
IDNum, IDName, Nation, 
    (SELECT SUM(LoyaltyPoint)
     FROM USERDATA 
     WHERE USERDATA.Knights = KNIGHTS.IDNum 
           AND USERDATA.Authority IN(1, 2)) as ClanLoyalty,
    (SELECT SUM(MannerPoint) 
     FROM USERDATA 
     WHERE USERDATA.Knights = KNIGHTS.IDNum 
           AND USERDATA.Authority IN(1, 2))) as MannerPoint 
FROM KNIGHTS 
ORDER BY ClanLoyalty DESC, MannerPoint DESC`

有一个带有额外括号的语法问题，应该是：

SELECT TOP 100 
IDNum, IDName, Nation, 
    (SELECT SUM(LoyaltyPoint)
     FROM USERDATA 
     WHERE USERDATA.Knights = KNIGHTS.IDNum 
           AND USERDATA.Authority IN(1, 2)) as ClanLoyalty,
    (SELECT SUM(MannerPoint) 
     FROM USERDATA 
     WHERE USERDATA.Knights = KNIGHTS.IDNum 
           AND USERDATA.Authority IN(1, 2) ) as MannerPoint 
FROM KNIGHTS 
ORDER BY ClanLoyalty DESC, MannerPoint DESC`

【讨论】：