单项选择题
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.
单项选择题 A UDT is a data type which:（）
单项选择题 Which of the following DB2 data types has a fixed length?（）
单项选择题 Which of the following actions may cause a trigger to be fired?（）
