單項(xiàng)選擇題

You are currently located in Singapore and have connected to a remote database in Chicago. You issue the following command:SQL> SELECT ROUND (SYSDATE-promo_begin_date, 0) FROM promotions WHERE (SYSDATE-promo_begin_date)/365 >2;PROMOTIONS is the public synonym for the public database link for the PROMOTIONS table. What is the outcome?（）

A.an error because the ROUND function specified is invalid
B.an error because the WHERE condition specified is invalid
C.number of days since the promo started based on the current Chicago date and time
D.number of days since the promo started based on the current Singapore date and time

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單項(xiàng)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

多項(xiàng)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