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Q&A for people looking to bypass life's everyday problems with simple tricks

-- result table, don't rename and keep the site column
create table #results (site nvarchar(250), accountid int,
  displayname nvarchar(40), reputation int);

declare @sql nvarchar(max) = ''   -- holds build up sql string

-- build one biq union sql, for each db
select @sql = @sql 
+ iif( len(@sql) > 1 
     , 'union all'
     , 'insert into #results'
) +
-- here goes the per site query, fully qualify the database objects
N'
select ''' + name + ''', accountid, displayname, reputation
from ' + quotename(name) + '.dbo.users
'
from sys.databases
where database_id > 5
  and (name not like '%.Meta' or name = 'StackExchange.Meta')
-- AccountId: The global account ID of the user, which you can find in the URL of their network profile. Visit this link: http://stackexchange.com/users/current to see your own ID.

--print @sql

-- execute it
exec (@sql)

-- show results
select rank() over (order by sum(reputation) desc) AS 'Rank',
  'https://stackexchange.com/users/' + cast(accountid as nvarchar)
  + '|' + max(displayname) AS 'User',
  sum(reputation) AS 'Total reputation'
from #results
group by accountid
order by sum(reputation) desc

drop table #results

view current version

edited aug 2 18

created aug 2 18 Glorfindel