I dunno. Grabbing some queries I've written, I find:

    select  db_name (u.dbid),
            sum (2 * u.size),
            sum (2 * curunreservedpgs (u.dbid, u.lstart, unreservedpgs
+))
      from  sysusages u, sysdevices d, sysdatabases db   
     where  d.low  <= u.vstart
       and  d.high >= u.vstart + u.size - 1
       and  d.status & 2 = 2
       and  u.segmap & 4 = 4
       and  not (u.segmap & 2 = 2 or u.segmap & 1 = 1)
       and  u.dbid  = db.dbid
       and  db.name not like "dbcc_%"
     group  by u.dbid
[download]

I wonder whether that's really going to look better using some kind of interface to an SQL query builder. I'm afraid it would get worse.

You know, when I started working with SQL, I made myself such a function, I'd pass it a table name, fields, possible other information, and it build an SQL query for me. But soon I found that for anything that isn't a trivial select, writing the SQL yourself was far easier and gave cleaner code.

-- Abigail