D major has two sharps
The D Major scale has two sharps, F and C. The notes in this scale are D, E F sharp, G, A, B, C sharp, D.
The mediant of any major scale is the note that is a third above the tonic (root) of the scale. In the key of F sharp major, the tonic is F sharp, so the mediant would be A sharp.
G major, D major, E major, B major, F sharp major, F sharp minor, A sharp major, etc.
The G-major scale has only one sharp (which is F#)
The subdominate refers to the fourth note of the scale ( assuming it is a diatonic scale). In this case the subdominate of the C sharp major scale would be F#.
The D Major scale has two sharps, F and C. The notes in this scale are D, E F sharp, G, A, B, C sharp, D.
The mediant of any major scale is the note that is a third above the tonic (root) of the scale. In the key of F sharp major, the tonic is F sharp, so the mediant would be A sharp.
D major isn't actually a note. D major is a major scale based on the note D (D natural) and the scale has two sharps (F sharp and C sharp). There isn't anything special about D major since it requires both an F sharp and a C sharp, the most 'special' scale is C major since there are no flats or sharps needed.
G major, D major, E major, B major, F sharp major, F sharp minor, A sharp major, etc.
The G-major scale has only one sharp (which is F#)
The subdominate refers to the fourth note of the scale ( assuming it is a diatonic scale). In this case the subdominate of the C sharp major scale would be F#.
G Major has one sharp, which is F sharp.
C, F, and G are sharp in this scale.
That would be C-sharp major. Every note is sharp.
The dominant (fifth) degree of a D sharp major scale is A sharp.
The major scale with 2 sharps is D major, they are F and C sharp.
C# major, E major, A major, B major, and C# minor.