Searching a user's posts by keyword, networkwide

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-- result table, don't rename and keep the site column
create table #results (site nvarchar(250), id 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'
     , 'insert into #results'
) +
-- here goes the per site query, fully qualify the database objects
N'
select ''' + name + '''
     , p.id
from ' + quotename(name) + '.dbo.posts as p
inner join ' + quotename(name) + '.dbo.users as u on p.owneruserid = u.id
where p.posttypeid = 2 and u.accountid = ' + CAST(##AccountId:int## AS nvarchar) + '
  and p.body LIKE ''%' + ##keyword:string## + '%'''
from sys.databases
where database_id > 5
-- and (name not like '%.Meta' or name = 'StackExchange.Meta')

--print @sql

-- execute it
exec (@sql)

-- show results
select
       -- URL builder from Lamak http://stackoverflow.com/a/38129701
      'http://' 
      + case PARSENAME(site,1)
        when 'audio' then 'avp'
        else PARSENAME(site,1)
        end 
      + coalesce('.' 
        + case PARSENAME(site,2)
          when 'audio' then 'avp'
          else PARSENAME(site,2)
          end , '')
      + IIF(patindex('%.MathOverflow%',site) > 0
      , ''
      , coalesce('.' + PARSENAME(site,3), '')
      )
      + IIF(patindex('%.MathOverflow%',site) > 0
      , '.net'
      , '.com'
      ) 
      + '/a/'
      + CAST(id AS nvarchar) 
from #results

drop table #results

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