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.

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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

Which of the following DB2 data types has a fixed length?（）

A.XML
B.BLOB
C.DOUBLE
D.DBCLOB

单项选择题

Which of the following actions may cause a trigger to be fired?（）

A.DROP
B.ALTER
C.DELETE
D.ROLLBACK