SELECT DISTINCT f1.C,f1.D,f1.G,f1.K FROM taskset.txt as f1 WHERE f1.C NOT IN (SELECT DISTINCT f2.C FROM taskset.txt as f2 WHERE (f2.G='vga15'))

[taskset]
ColNameHeader=True
Format=TabDelimited
CharacterSet=65001
Col1="A" Char Width 100
Col2="B" Char Width 100
Col3="C" Char Width 300
Col4="D" Char Width 8
Col5="E" Char Width 8
Col6="F" Char Width 30
Col7="G" Char Width 30
Col8="H" Char Width 8
Col9="I" Char Width 10
Col10="J" Char Width 8
Col11="K" Char Width 30