While Loop to Iterate through Databases

Question

I was wondering if someone could help me with creating a while loop to iterate through several databases to obtain data from one table from two columns. this is was I have done

Answer 1

My code to search for data from more than one database would be:

use [master]

go

if object_id('tempdb.dbo.#database') is not null 

    drop TABLE #database

go

create TABLE #database(id INT identity primary key, name sysname)

go

set nocount on

insert into #database(name)

select name

from sys.databases

where name like '%tgsdb%' --CHANGE HERE THE FILTERING RULE FOR YOUR DATABASES!

and source_database_id is null

order by name

Select *
from #database

declare @id INT, @cnt INT, @sql NVARCHAR(max), @currentDb sysname;

select @id = 1, @cnt = max(id)
from #database

while @id <= @cnt

BEGIN

        select @currentDb = name
    from #database
    where id = @id

    set @sql = 'select Column1, Column2 from ' + @currentDb + '.dbo.Table1'
    print @sql
    exec (@sql);
    print '--------------------------------------------------------------------------'
    set @id = @id + 1;

END

go