D flat minor exists only in theory and not in practice, it's key signature would have six flats (Eb, Ab, Db, Gb Cb and Fb) and one double-flat (Bbb). It's notation can be expressed by the far simpler key of C-sharp minor - with only 4 sharps.
One flat in the key signature indicates that the music is in the key of F major or D minor.
Assuming the key signature has only one flat (B Flat) then the key is either F Major, or D minor.
The key signature for D sharp minor would be the one for F sharp major: FCGDAE. You can also think of it as E flat minorwhich is related to g flat major in which the key signature would be BEADGC.
6 flats. B, E, A, D, G and C.
A relative minor key is the minor key with the same key signature as a particular major key, for example D minor and F major both have one flat (Bb).
That is the signature for the key of Db. Or, it's relative minor, Bb minor.
D major has a key signature of F sharp and C sharp D minor has a key signature of B flat
One flat in the key signature indicates that the music is in the key of F major or D minor.
Assuming the key signature has only one flat (B Flat) then the key is either F Major, or D minor.
The key signature with only a B-flat is either F major or D minor.
The key signature for F major has one flat (B flat) , while the key signature for F minor has four flats (B flat, E flat, A flat, and D flat).
Only "B flat" is the key signature, then "C sharp" is the accidental.
The key signature for D sharp minor would be the one for F sharp major: FCGDAE. You can also think of it as E flat minorwhich is related to g flat major in which the key signature would be BEADGC.
F major, or D minor. The flat is b flat.
F Major...or D Minor
There is no key signature for D harmonic minor in particular - as the raised seventh is not part of the key signature. In all clefs, D minor has one flat and in all cases (since the raised seventh in this scale is C♯), to avoid confusion it is best to avoid having both a sharp and a flat in the same key signature.
Relative major and minor share the same key signature but a different tonic note (a tonic note is the first note of the scale or in solfege tonic is DO). For example, D flat major has five flats in it's key signature and b flat minor has 5 flats in it's key signature; therefore, D flat major and b flat minor are relative.