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DECLARE @rn INT = 1, @dbname varchar(MAX) = '';
WHILE @dbname IS NOT NULL
BEGIN
SET @dbname = (SELECT name FROM (SELECT name, ROW_NUMBER() OVER (ORDER BY name) rn
FROM sys.databases WHERE name NOT IN('master','tempdb')) t WHERE rn = @rn);
IF @dbname <> '' AND @dbname IS NOT NULL
EXECUTE ('use '+QUOTENAME(@dbname)+';
/* Your script code here */
UPDATE some_table SET ;
');
SET @rn = @rn + 1;
END;