Logic for dleting single recored

Hi ALl,

I have an interbnal table where i want do delete the records with single value in particular field.

FOr example, MARC is fetched into It-MARC.then IT_MARC should have deleted for materials with single value.

MATN NO      Plant

M1                 p1

M2                 p2

M2                 p3

Record M1 should be deleted.Can anybody kindly suggest logic for this?

Thanks,

SD