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-- start create url from dbname
IF OBJECT_ID ( '#siteurl', 'P' ) IS NOT NULL 
    DROP PROCEDURE #siteurl;
GO
create procedure #siteurl
   @dbname nvarchar(250),
   @res nvarchar(250) OUT
   as
   begin
      -- we have three sites that have borked DNS entries
      set @dbname = (case @dbname
      when 'StackExchange.Audio' then 'StackExchange.Avp'
      when 'StackExchange.Audio.Meta' then 'StackExchange.Avp.Meta'
      when 'StackExchange.Mathoverflow.Meta' then 'net.Mathoverflow.meta'
      else @dbname
      end)
      -- and one of those doesn't want to end with .com
      if @dbname <> 'net.Mathoverflow.meta' 
         set @dbname = 'com.' + @dbname
      exec #recursesiteurl @dbname,  @res OUTPUT
   end
GO
-- create url from dbname
IF OBJECT_ID ( '#recursesiteurl', 'P' ) IS NOT NULL 
    DROP PROCEDURE #recursesiteurl;
GO
create procedure #recursesiteurl
   @dbname nvarchar(250),
   @res nvarchar(250) OUT
   as
   begin
      declare @pos integer
      declare @rec nvarchar(250)

      set @res = @dbname
      set @pos = CHARINDEX('.', @dbname)
      if (@pos > 0 ) 
      begin
         set @rec = substring(@dbname, @pos+1, len(@dbname))
         exec #recursesiteurl @rec,  @rec output
         set @res = @rec 
                  + '.' 
                  + substring(@dbname, 0, @pos) 
      end
   end;
GO

declare @tag nvarchar(25) = ##tag:string##  -- tag1
declare @tag2 nvarchar(25) = ##tag2:string##  -- tag2

-- all databases
declare  db_c cursor for select [name] 
                         from sys.databases 
                         where database_id > 5 -- skip master, temp, model, msdb, Data.SE

declare @db_c_name sysname   -- holds name of db after fetch
declare @sql nvarchar(max) -- holds build up sql string

-- result table
create table #all_tags ( site nvarchar(250)
                       , creationdate datetime
                       , tagcount int
                       , tagname nvarchar(200));

open db_c
fetch next from db_c into @db_c_name
while(@@FETCH_STATUS = 0)
begin
    set @sql = N'use '+ QUOTENAME(@db_c_name) +';
               declare @url nvarchar(250)
               exec #siteurl ''' + @db_c_name  + ''', @url output
               insert into #all_tags 
               select @url
               , cast(p.creationdate as date)
               , count(*) as tagcount
               , tagname
               from posts p 
               inner join posttags pt on pt.postid = p.id
               inner join tags t on t.id = pt.tagid 
               where t.tagname in ('''+ @tag + ''','''+ @tag2 + ''') and
               year(CreationDate) = 2019 
               group by cast(p.creationdate as date)
               , t.tagname
               ;'
    exec (@sql)
   fetch next from db_c into @db_c_name
end;
close db_c;
deallocate db_c;

select /* replace(
       replace(
       replace(site,
         '.StackExchange.com',''),
         '.com',''),
         '.net','') as [site]
         ,*/ dateadd(d, -datepart(dw, creationdate), creationdate)
     , tagname
     , sum(tagcount)
from #all_tags
group by dateadd(d, -datepart(dw, creationdate), creationdate)
, tagname
order by dateadd(d, -datepart(dw, creationdate), creationdate)
, tagname

drop table #all_tags

drop procedure #recursesiteurl
drop procedure #siteurl

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