你可能感興趣的試題

Examine the structures of the EMPLOYEES and TAX tables.
EMPLOYEES
EMPLOYEE_ID NUMBER NOT NULL, Primary
Key
EMP_NAME VARCHAR2 (30)
JOB_ID VARCHAR2 (20)
SALARY NUMBER
References
MGR_ID NUMBER
EMPLOYEE_ID
column
DEPARTMENT_ID NUMBER Foreign key to
DEPARTMENT _ID
column of the
DEPARTMENT table
TAX
MIN_SALARY NUMBER
MAX_SALARY NUMBER
TAX_PERCENT NUMBER
Percentage tax for given
salary range
You need to find the percentage tax applicable for each employee. Which SQL statement would you use?（）

A. SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE e.salary BETWEEN t.min _ salary AND t.max_salary
B. SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE e.salary > t.min_salary, tax_percent
C. SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE MIN(e.salary) = t.min_salary AND MAX(e.salary) = t.max_salary
D. You cannot find the information because there is no common column between the two tables.

多項選擇題

Which two statements are true regarding the ORDER BY clause? （）

A. The sort is in ascending by order by default.
B. The sort is in descending order by default.
C. The ORDER BY clause must precede the WHERE clause.
D. The ORDER BY clause is executed on the client side.
E. The ORDER BY clause comes last in the SELECT statement.
F. The ORDER BY clause is executed first in the query execution.

The STUDENT_GRADES table has these columns: The registrar has asked for a report on the average grade point average (GPA) for students enrolled during semesters that end in the year 2000. Which statement accomplish this?（）

你可能感興趣的試題

Which two statements are true regarding the ORDER BY clause? （）

The STUDENT_GRADES table has these columns:

The registrar has asked for a report on the average grade point average (GPA) for students enrolled during semesters that end in the year 2000. Which statement accomplish this?（）