On Jan 11， 2005 at 2：30 P.M.， an erroneous update operation modified all the values of column LASTNAME in the EMPLOYEE table in the Scott schema to an empty string. You are the system administrator， and you want to return the original values in the table. To do so， you decided to flash back the table. Which two options can you use to flash back a table？（） by using Oracle Enterprise Manager。 by issuing the FLASHBACK TABLE statement at the RMAN prompt。 by issuing the FLASHBACK TABLE statement at the SQL prompt。 by issuing the FLASHBACK TABLE statement at the LSNRCTL prompt。
You executed the following command to create a tablespace called SALES_DATA： > CREATE TABLESPACE sales_data DATAFILE SIZE 100M SEGMENT SPACE MANAGEMENT AUTO； Which two statements are true about the SALES_DATA tablespace （） The database automatically determines the extent-sizing policy for the tablespace.。 The segments are automatically shrunk when the contents are removed from them.。 The allocation of extents within the tablespace is managed through the dictionary tables.。 The space utilization description of the data blocks in segments is recorded inbitmapblocks.。 The space utilization description of the data blocks in segments is managed through free lists.MANUAL。
You need to display the last names of those employees who have the letter “A” as the second character in their names.Which SQL statement displays the required results?（） SELECT last_name FROM EMP WHERE last_name LIKE ‘_A%’;。 SELECT last_name FROM EMP WHERE last name =’*A%’。 SELECT last_name FROM EMP WHERE last name =’_A%’;。 SELECT last_name FROM EMP WHERE last name LIKE ‘*A%&rsquo。
我国阀门行业规定了“三化”标准，即（）、通用化和标准化。 A、单一化 。 B、专业化 。 C、系列化 。 D、多元化。
决策理论学派的代表人物是（） 韦伯。 孔茨。 巴纳德。 西蒙。
Which statement is true about items that have been assembled into a kit？ （）
