如何在使用内部联接时在sql server中计数？

Question

我有以下查询:

SELECT  
   h.helpcontent, s.MenuID, s.pkSitePageId, s.PageAliasName,
   s.SitePageName,s.pagepath
FROM 
   tblSiteRolePermissions p
INNER JOIN 
   tblSitePages s ON p.fkSitePageId = s.pkSitePageId
INNER JOIN 
   tblHelp h ON s.pkSitePageId=h.fkSitePageId
WHERE 
   (p.fkRoleId = 4 AND p.ViewOnly = 1) 
ORDER BY 
   s.pkSitePageId

我想从中得到好处tblSiteRolePermissions.我试过Count但它抛出一些错误,如:

消息8120,级别16,状态1,行1
列'tblHelp.HelpContent'在选择列表中无效,因为它不包含在聚合函数或GROUP BY子句中.

请帮帮我,让我知道我哪里错了.

更新

这是我正在尝试的代码:

SELECT 
    count(p.pkRolePermissionId), 
    h.helpcontent, s.MenuID, s.pkSitePageId, s.PageAliasName, 
    s.SitePageName, s.pagepath
FROM
    tblSiteRolePermissions p
INNER JOIN 
    tblSitePages s ON p.fkSitePageId = s.pkSitePageId
INNER JOIN
    tblHelp h ON s.pkSitePageId = h.fkSitePageId
WHERE 
    (p.fkRoleId = 4 AND p.ViewOnly = 1) 
ORDER BY 
    s.pkSitePageId

Answer 1

如果使用聚合函数,则需要GROUP BY在SELECT语句中的其余字段中使用不在聚合中的子句.与此类似:

SELECT  count(p.pkRolePermissionId) CountRolePermission,
  h.helpcontent, 
  s.MenuID, 
  s.pkSitePageId, 
  s.PageAliasName,
  s.SitePageName,
  s.pagepath
from tblSiteRolePermissions p
INNER JOIN tblSitePages s 
  ON p.fkSitePageId = s.pkSitePageId
inner join tblHelp h 
  on s.pkSitePageId=h.fkSitePageId
WHERE (p.fkRoleId =4 and p.ViewOnly=1) 
GROUP BY h.helpcontent, 
  s.MenuID, 
  s.pkSitePageId, 
  s.PageAliasName,
  s.SitePageName,
  s.pagepath
ORDER BY s.pkSitePageId

如果你想要所有行的计数,那么你可以使用这样的东西:

SELECT  NumRows.TotalCount,
  h.helpcontent, 
  s.MenuID, 
  s.pkSitePageId, 
  s.PageAliasName,
  s.SitePageName,
  s.pagepath
from tblSiteRolePermissions p
INNER JOIN tblSitePages s 
  ON p.fkSitePageId = s.pkSitePageId
inner join tblHelp h 
  on s.pkSitePageId=h.fkSitePageId
cross join
(
  SELECT  count(*) TotalCount
  from tblSiteRolePermissions p
  INNER JOIN tblSitePages s 
    ON p.fkSitePageId = s.pkSitePageId
  inner join tblHelp h 
    on s.pkSitePageId=h.fkSitePageId
  WHERE (p.fkRoleId =4 and p.ViewOnly=1) 
) NumRows
WHERE (p.fkRoleId =4 and p.ViewOnly=1) 
ORDER BY s.pkSitePageId

或者您可以在查询中使用CTE,类似于:

;with cte as 
(
  SELECT h.helpcontent, 
    s.MenuID, 
    s.pkSitePageId, 
    s.PageAliasName,
    s.SitePageName,
    s.pagepath
  from tblSiteRolePermissions p
  INNER JOIN tblSitePages s 
    ON p.fkSitePageId = s.pkSitePageId
  inner join tblHelp h 
    on s.pkSitePageId=h.fkSitePageId
  WHERE (p.fkRoleId =4 and p.ViewOnly=1) 
)
select h.helpcontent, 
    s.MenuID, 
    s.pkSitePageId, 
    s.PageAliasName,
    s.SitePageName,
    s.pagepath, 
    (select count(*) from cte) as Total
from cte