Question

I’m trying to output some data in MSSQL from 3 different tables (status, status & cases) in 2 different databases (global & private).

global.status    // contains labels for global status ID's
     fields (id, text)
private.status   // contains labels for private status ID's
     fields (id, text)
private.cases    // contain case information, such as status
     fields (status, count(status) AS amount)

I need to compare the status in the cases table with the status ID in the two status tables and output the following:

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

The reson for having global and private is that private allows custom private status where global is accessible throughout the system.

My unsuccessful attempt with this was the following sql

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

Do you have any idea what to do??

Answer 1

You might union/union all local and global statuses if they are distinct:

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

If they overlap, you need to define which one takes precedence and use full outer join on them.

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