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

DECLARE @Loop int
DECLARE @MaxLoop int
DECLARE @DBName varchar(300)
DECLARE @SQL varchar(max)

SET @Loop = 1
SET @DBName = ''

set nocount on
SET @MaxLoop =  (select count([name]) FROM sys.databases where [name] like 'Z%')
WHILE @Loop <= @MaxLoop
    BEGIN
        SET @DBName = (select TableWithRowsNumbers.name from (select ROW_NUMBER() OVER (ORDER by [name]) as Row,[name] FROM sys.databases where [name] like 'Z%' ) TableWithRowsNumbers where Row = @Loop)
        SET @SQL = 'USE [' + @DBName + ']'
        exec (@SQL)
        ...
        ...
        set @Loop = @Loop + 1
    END

***Note: I didn't add the check if exists here.