Thurstone's primary abilities did not include music.
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There are one million millimeters in a kilometer, so a millimeter would represent one millionth of a kilometer.
No. Primary is a cardinal number so "first" may be considered as the equivalent primary number but not "one".
We designate one of the candidate key of a relation to be a primary key because that primary key is use for any foreign key references.
A lower-case 'm' represents one-thousandth, so the symbol 'mA' would represent one-thousandth of an ampere. An upper-case 'M', on the other hand, represets one-million, so the symbol 'MA' would represent one-million amperes.
I think super key is treated as the primary key because in a table their will be only one primary key.