单选题A UDT is a data type which:（）Amust contain unique values.Bcannot be CAST to other data types.Cis created using the CREATE DISTINCT command.Dcontains a value that was automatically calculated from values in other columns.
单选题
A UDT is a data type which:（）
A
must contain unique values.
B
cannot be CAST to other data types.
C
is created using the CREATE DISTINCT command.
D
contains a value that was automatically calculated from values in other columns.
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