Shown below are scale tone chords derived from the A melodic minor scale. Because of the sharpened 6th degree there will be more changes to the types of chords derived from this scale. Notice that chord 2 is now minor instead of major, and also that chord 4 is major instead of minor and chord 6 is diminished instead of major. These changes are all brought about by the raising of the 6th degree of the scale from F to F#.
When playing music in minor keys, it is common to use chords from all three types of minor scales. A good example of this is the song House of the Rising Sun. The chords to this song are written below in arpeggio style in the key of A minor. Look through the chords and see which ones come from each type of minor scale. Once you have done this, transpose it to several other keys.