Sql server 从多个表中获取值，使用计数和分组方式

我试图在MSSQL中从2个不同数据库（全局和私有）中的3个不同表（状态、状态和案例）输出一些数据

我需要将案例表中的状态与两个状态表中的状态ID进行比较，并输出以下内容：

    statusID |    text     | amount
   ----------|-------------|--------
     9993    |    Open     |   24
     9991    |   Closed    |    3
     9992    |   Pending   |   12

拥有全局和私有的原因是私有允许自定义私有状态，其中全局可在整个系统中访问

我尝试使用以下sql语句失败

SELECT  c.status, 
    COUNT(c.status) as amount, 
    ss.text,
    gs.text
FROM [DB11111111].dbo].[cases] AS c, [DB11111111].[dbo].[status] AS ss, [global].[dbo].[status] AS gs
WHERE (c.status = ss.id) OR (c.status = gs.id)
GROUP BY c.status, ss.text, gs.text 
ORDER BY amount DESC

---

你知道该怎么做吗？？？

如果本地和全局状态不同，你可以合并/合并它们：

SELECT  c.status, 
    COUNT(c.status) as amount, 
    s.text
FROM [DB11111111].dbo.[cases] AS c
LEFT JOIN
(
   select id, [text]
     from [DB11111111].[dbo].[status] 
   union all
   select id, [text]
     from [global].[dbo].[status]
) s
  ON c.Status = s.Id
GROUP BY c.status, s.Text
ORDER BY amount DESC

如果它们重叠，您需要定义哪个优先，并对它们使用完全外部联接

SELECT  c.status, 
    COUNT(c.status) as amount, 
    s.text
FROM [DB11111111].dbo.[cases] AS c
LEFT JOIN
(
   -- local before global
   select isnull (l.id, g.id) ID
          isnull (l.[text], g.[text]) [text]
     from [DB11111111].[dbo].[status] l
     full outer join [global].[dbo].[status] g
       on l.id = g.id
) s
  ON c.Status = s.ID
GROUP BY c.status, s.Text
ORDER BY amount DESC

---

可以在private和global status表中找到相同的ID吗？是的，cases中的status字段包含一个与global.status或private.status中的ID相等的数字。这非常有效！！唯一的改动是一些大写字母，并将“s.text”改为“cast（s.text为varchar（100））”谢谢！这也可以100%工作，但另一种解决方案只在count不是0时提供输出，我的缺点是没有指定它。。

SELECT  c.status, 
    COUNT(c.status) as amount, 
    s.text
FROM [DB11111111].dbo.[cases] AS c
LEFT JOIN
(
   -- local before global
   select isnull (l.id, g.id) ID
          isnull (l.[text], g.[text]) [text]
     from [DB11111111].[dbo].[status] l
     full outer join [global].[dbo].[status] g
       on l.id = g.id
) s
  ON c.Status = s.ID
GROUP BY c.status, s.Text
ORDER BY amount DESC

SELECT  *
FROM    (
        SELECT  id, text
        FROM    private
        UNION ALL
        SELECT  id, text
        FROM    global
        ) q
CROSS APPLY
        (
        SELECT  COUNT(*) cnt
        FROM    cases
        WHERE   status = q.id
        GROUP BY
                status
        ) c