SELECT     TOP (100) PERCENT SUM(dbo.verkopen.bedrag) AS ex
FROM         dbo.verkopen INNER JOIN
                      dbo.doss ON dbo.verkopen.ino = dbo.doss.ino INNER JOIN
                      dbo.vdagbk ON dbo.verkopen.ino = dbo.vdagbk.ino
WHERE     (dbo.doss.uitvoerder LIKE 'zz') AND (dbo.doss.dosno LIKE '101111')