Something like this?

SELECT DB_NAME(database_id) AS DatabaseName,

SUM(CASE WHEN type=0 THEN size ELSE 0 END) AS MdfSize,

SUM(CASE WHEN type=1 THEN size ELSE 0 END) AS LdfSize

FROM sys.master_files

GROUP BY database_id

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Deja View - The strange feeling that somewhere, sometime you've optimised this query before

How to get the best help on a forum

http://www.sqlservercentral.com/articles/Best+Practices/61537