多项选择题

Which three statements are true regarding the data types in Oracle Database 10g/11g?（）

A.Only one LONG column can be used per table
B.A TIMESTAMP data type column stores only time values with fractional seconds
C.The BLOB data type column is used to store binary data in an operating system file
D.The minimum column width that can be specified for a VARCHAR2 data type column is one
E.The value for a CHAR data type column is blank-padded to the maximum defined column width

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Which two statements are true regarding subqueries? （）

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B.Only two subqueries can be placed atone level
C.A subquery can be used only in SQL query statements
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E.There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement

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Which two statements are true regarding single row functions?（）

A.They accept only a single argument
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You need to generate a list of all customer last names with their credit limits from the CUSTOMERS table. Those customers who do not have a credit limit should appear last in the list. Which two queries would achieve the required result?（）

A.SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit DESC
B.SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit
C.SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit NULLS LAST
D.SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_last_name, cust_credit_limit NULLSLAST