選擇題：

　　神州數(shù)碼筆試1)Which statement shows the maximum salary paid in each job category of each department?_______

　　A。 select dept_id， job_cat，max(salary) from employees where salary > max(salary);

　　B。 select dept_id， job_cat，max(salary) from employees group by dept_id，job_cat;

　　C。 select dept_id， job_cat，max(salary) from employees;

　　D。 select dept_id， job_cat，max(salary) from employees group by dept_id;

　　E。 select dept_id， job_cat，max(salary) from employees group by dept_id，job_cat，salary;

　　神州數(shù)碼筆試2)description of the students table:

　　sid_id number

　　start_date date

　　end_date date

　　which two function are valid on the start_date column?_________。

　　A。 sum(start_date)

　　B。 avg(start_date)

　　C。 count(start_date)

　　D。 avg(start_date，end_date)

　　E。 min(start_date)

　　F。 maximum(start_date)

　　神州數(shù)碼筆試3)for which two constraints does the oracle server implicitly create a unique index?______。

　　A。 not null

　　B。 primary

　　C。 foreign key

　　D。 check

　　E。 unique

　　神州數(shù)碼筆試4)in a select statement that includes a where clause，where is the group by clause placed in the select statement?______。

　　A。 immediately after the select clause

　　B。 before the where clause

　　C。 before the from clause

　　D。 after the order by clause

　　E。 after the where clause

　　神州數(shù)碼筆試5)in a select statement that includes a where clause，where is the order by clause placed in the select statement?______。

　　A。immediately after the select clause

　　B。before the where clause

　　C。after all clause

　　D。after the where clause

　　E。before the from clause

　　神州數(shù)碼筆試6)evaluate there two sql statements______。

　　Select last_name，salary from employees order by salary;

　　Select last_name，salary from employees order by 2 asc;

　　A。the same result B。different result C。the second statement returns a syntax error

　　神州數(shù)碼筆試7) you would like to display the system date in the format“20051110 14：44：17”。Which select statement should you use?______。

　　A。 select to_date(sydate，’yearmmdd hh:mm:ss’)from dual;

　　B。 select to_char(sydate，’yearmonthday hh:mi:ss’)from dual;

　　C。 select to_date(sydate，’yyyymmdd hh24:mi:ss’)from dual;

　　D。 select to_char(sydate，’yyyymmdd hh24:mi:ss’)from dual;