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单选题
Which of the following datatypes are used in situations where you want an ordered set of data elements, where every element is the same datatype, and where you predefine the number of elements that appear in the set?（）
A
REF
B
TABLE
C
CLOB
D
VARRAY
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TIMESTAMPB
DATEC
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单选题Which of the following datatypes are used in situations where you want an ordered set of data elements, where every element is the same datatype, and where you predefine the number of elements that appear in the set?（）A
REF B
TABLE C
CLOB D
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单选题In which of the following situations should correlation names be used?（）A
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Two or more tables in the FROM clause have identical column names.D
The FROM clause contains two or more tables in the SELECT statement.
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