Examine the description of the STUDENTS table:
STD_ID NUMBER(4)
COURSE_ID VARCHAR2(10)
START_DATE DATE
END_DATE DATE
Which two aggregate functions 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)
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Examine this statement:
SELECT student_id, gpa
FROM student_grades
WHERE gpa > &&value;
You run the statement once, and when prompted you enter a value of 2.0. A report is produced. What happens when you run the statement a second time?()
A.An error is returned.
B.You are prompted to enter a new value.
C.A report is produced that matches the first report produced.
D.You are asked whether you want a new value or if you want to run the report based on the previous value.
Evaluate the set of SQL statements:
CREATE TABLE dept
(deptno NUMBER(2),
dname VARCHAR2(14),
loc VARCHAR2(13));
ROLLBACK;
DESCRIBE DEPT
What is true about the set?()
A.The DESCRIBE DEPT statement displays the structure of the DEPT table.
B.The ROLLBACK statement frees the storage space occupied by the DEPT table.
C.The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist.
D.The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.
Examine the structure of the EMPLOYEES and DEPARTMENTS tables:
EMPLOYEES
EMPLOYEE_ID NUMBER
DEPARTMENT_ID NUMBER
MANAGER_ID NUMBER
LAST_NAME VARCHAR2(25)
DEPARTMENTS
DEPARTMENT_ID NUMBER
MANAGER_ID NUMBER
DEPARTMENT_NAME VARCHAR2(35)
LOCATION_ID NUMBER
You want to create a report displaying employee last names, department names, and locations. Which query should you use?()
A.SELECT e.last_name, d. department_name, d.location_id FROM employees e NATURAL JOIN departments D USING department_id ;
B.SELECT last_name, department_name, location_id FROM employees NATURAL JOIN departments WHERE e.department_id =d.department_id;
C.SELECT e.last_name, d.department_name, d.location_id FROM employees e NATURAL JOIN departments d;
D.SELECT e.last_name, d.department_name, d.location_id FROM employees e JOIN departments d USING (department_id );
A.Once created, a sequence belongs to a specific schema.
B.Once created, a sequence is linked to a specific table.
C.Once created, a sequence is automatically available to all users.
D.Only the DBA can control which sequence is used by a certain table.
E.Once created, a sequence is automatically used in all INSERT and UPDATE statements.
A.You can use aggregate functions in any clause of a SELECT statement.
B.You can use aggregate functions only in the column list of the SELECT clause and in the WHERE clause of a SELECT statement.
C.You can mix single row columns with aggregate functions in the column list of a SELECT statement by grouping on the single row columns.
D.You can pass column names, expressions, constants, or functions as parameters to an aggregate function.
E.You can use aggregate functions on a table, only by grouping the whole table as one single group.
F.You cannot group the rows of a table by more than one column while using aggregate functions.
Evaluate the SQL statement:
SELECT LPAD(salary,10,*)
FROM EMP
WHERE EMP_ID = 1001;
If the employee with the EMP_ID 1001 has a salary of 17000, what is displayed?()
A. 17000.00
B. 17000*****
C. ****170.00
D. **17000.00
E.an error statement
The EMPLOYEES table contains these columns:
EMPLOYEE_ID NUMBER(4)
LAST_NAME VARCHAR2 (25)
JOB_ID VARCHAR2(10)
You want to search for strings that contain 'SA_' in the JOB_ID column. Which SQL statement do you use?()
A.SELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA\_%' ESCAPE '\';
B.SELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA_';
C.SELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA_' ESCAPE "\";
D.SELECT employee_id, last_name, job_id FROM employees WHERE job_id = '%SA_';
Evaluate this SQL statement:
SELECT e.EMPLOYEE_ID,e.LAST_NAME,e.DEPARTMENT_ID, d.DEPARTMENT_NAME
FROM EMPLOYEES e, DEPARTMENTS d
WHERE e.DEPARTMENT_ID = d.DEPARTMENT_ID;
In the statement, which capabilities of a SELECT statement are performed?()
A.selection, projection, join
B.difference, projection, join
C.selection, intersection, join
D.intersection, projection, join
E.difference, projection, product
Evaluate these two SQL statements:
SELECT last_name, salary , hire_date
FROM EMPLOYEES
ORDER BY salary DESC;
SELECT last_name, salary , hire_date
FROM EMPLOYEES
ORDER BY 2 DESC;
What is true about them?()
A.The two statements produce identical results.
B.The second statement returns a syntax error.
C.There is no need to specify DESC because the results are sorted in descending order by default.
D.The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
A.You have too many tables.
B.Your tables are too long.
C.Your tables have difficult names.
D.You want to work on your own tables.
E.You want to use another schema's tables.
F.You have too many columns in your tables.
最新试题
The user Alice wants to grant all users query privileges on her DEPT table. Which SQL statement accomplishes this? ()
You need to design a student registration database that contains several tables storing academic information.The STUDENTS table stores information about a student. The STUDENT_GRADES table storesinformation about the student's grades. Both of the tables have a column named STUDENT_ID. The STUDENT_ID column in the STUDENTS table is a primary key.You need to create a foreign key on the STUDENT_ID column of the STUDENT_GRADES table thatpoints to the STUDENT_ID column of the STUDENTS table. Which statement creates the foreign key?()
Which are /SQL*Plus commands? ()
Which two are true about aggregate functions?()
Which object privileges can be granted on a view? ()
The PRODUCTS table has these columns:PRODUCT_ID NUMBER(4)PRODUCT_NAME VARCHAR2(45)PRICE NUMBER(8,2)Evaluate this SQL statement:SELECT *FROM PRODUCTSORDER BY price, product _ name;What is true about the SQL statement? ()
Which two statements about subqueries are true? ()
Examine the structure of the EMPLOYEES table:EMPLOYEE_ID NUMBER NOT NULL, Primary KeyEMP_NAME VARCHAR2(30)JOB_ID NUMBER\SAL NUMBERMGR_ID NUMBER References EMPLOYEE_ID columnDEPARTMENT_ID NUMBER Foreign key to DEPARTMENT_ID column of the DEPARTMENTS table You created a sequence called EMP_ID_SEQ inorderto populate sequential values for the EMPLOYEE_ID column of the EMPLOYEES table. Which two statements regarding the EMP_ID_SEQ sequence are true? ()
Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary KeyFIRST_NAME VARCHAR2(25)LAST_NAME VARCHAR2(25)HIRE_DATE DATEWhich INSERT statement is valid? ()
Which statement accomplish this? ()