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單項選擇題

Which statement is true regarding subqueries?（）

A.The LIKE operator cannot be used with single-row subqueries
B.The NOT IN operator is equivalent to IS NULL with single-row subqueries
C.=ANY and =ALL operators have the same functionality in multiple-row subqueries
D.The NOT operator can be used with IN, ANY, and ALL operators in multiple-row subqueries

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多項選擇題

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

多項選擇題

Which two statements are true regarding subqueries? （）

A.A subquery can retrieve zero or more rows
B.Only two subqueries can be placed atone level
C.A subquery can be used only in SQL query statements
D.A subquery can appear on either side of a comparison operator
E.There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement