In which scenario would TOP N analysis be the best solution?（）

A、You want to identify the most senior employee in the company.

B、You want to find the manager supervising the largest number of employees.

C、You want to identify the person who makes the highest salary for all employees.

D、You want to rank the top three sales representatives who have sold the maximum number of products.

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• 下列哪个不是有效的数据库状态？（）

  A、开机

  B、关闭

  C、启动

  D、装载

  E、不装载

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• The EMPLOYEES table has these columns: LAST NAME VARCHAR2(35) SALARY NUMBER(8,2) HIRE_DATE DATE Management wants to add a default value to the SALARY column. You plan to alter the table by using this SQL statement: ALTER TABLE EMPLOYEES MODIFY ( SALARY DEFAULT 5000); What is true about your ALTER statement?（）

  A、Column definitions cannot be altered to add DEFAULT values.

  B、A change to the DEFAULT value affects only subsequent insertions to the table.

  C、Column definitions cannot be altered at add DEFAULT values for columns with a NUMBER data type.

  D、All the rows that have a NULL value for the SALARY column will be updated with the value 5000.

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• 下列哪个对象属于模式对象（）。

  A、数据段

  B、盘区

  C、表

  D、表空间

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• In which two cases would you use an outer join? （）

  A

  The tables being joined have NOT NULL columns.

  B

  The tables being joined have only matched data.

  C

  The columns being joined have NULL values.

  D

  The tables being joined have only unmatched data.

  E

  The tables being joined have both matched and unmatched data.

  F

  Only when the tables have a primary key/foreign key relationship.

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• Which SELECT statement should you use to extract the year from the system date and display it in the format "1998"? （）

  A、SELECT TO_CHAR(SYSDATE,'yyyy') FROM dual;

  B、SELECT TO_DATE(SYSDATE,'yyyy') FROM dual;

  C、SELECT DECODE(SUBSTR(SYSDATE, 8), 'YYYY') FROM dual;

  D、SELECT DECODE(SUBSTR(SYSDATE, 8), 'year') FROM dual;

  E、SELECT TO_CHAR(SUBSTR(SYSDATE, 8,2),'yyyy') FROM dual;

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